SANTA LUCIA, PERU -- Senior Peruvian military officers recently tipped off major drug traffickers to planned Drug Enforcement Administration raids here in Peru's prime coca-growing valley, raising U.S. fears that a DEA campaign to attack the local drug trade may be compromised, according to U.S. and Peruvian officials and intelligence reports.

U.S. officials and Peruvian police have received what they consider reliable reports that a delegation of Peruvian drug trafficking "firms" met this month with top Peruvian army commanders at Uchiza, a village about 20 miles south of this U.S.-built anti-narcotics base.

The meeting took place on a day when a DEA agent and a Peruvian police official based here had gone to Uchiza to brief army officers on plans for raids against drug laboratories and clandestine airstrips around Campanilla, a village to the north, during the next eight days.

The day after the meeting, one of the traffickers called a colleague in Campanilla and warned him of the DEA-police operations, saying they would "start hitting Campanilla hard," according to a transcript of the conversation prepared by Peruvian police and passed along to U.S. officials.

The trafficker also boasted that the group "made an agreement" with an unnamed Peruvian general who "asked for a contribution from all of us," the transcript showed. A copy of the transcript was shown to The Washington Post by a Peruvian anti-narcotics source.

U.S. and Peruvian officials refused to disclose sources and methods used to prepare the transcript. But a U.S. official said embassy officials consider it authentic and added that it raised new concerns about security of DEA operations here, considered among the most hazardous in the drug war.

The intelligence reports also threatened to intensify a long-standing controversy over the Peruvian military's resistance to U.S.-backed anti-drug operations here. This resistance has been cited by U.S. officials as a key obstacle to disrupting the thriving local traffic in coca leaves and paste for the U.S. cocaine market.

"The important thing is this is evidence that the army is talking to and giving some kind of protection to the traffickers," said an anti-narcotics expert who has seen the transcript and other intelligence reports. "Right now, the {drug} planes are landing easily at Uchiza. They are coming and going as they please. . . . The police have lost all control over the traffickers in the valley."

Gen. Mario Britto, the previous military commander in this region known as the Upper Huallaga Valley, was ambushed by leftist guerrillas last month and was recuperating at a Lima hospital at the time of the alleged meeting. His successor, Gen. Oswaldo Hanke Velasco, could not be reached for comment, but U.S. and Peruvian officials said they do not believe he had begun serving at the post when the meeting occurred.

A senior Peruvian military official, speaking on condition that he not be quoted by name, called the allegations about the army meeting with traffickers "total falsehoods." Allegations of military corruption have been "fabricated by the DEA" because of the military's resistance to DEA proposals to intensify anti-drug operations, the official said, adding that such stepped-up action would only alienate the peasants and drive them into the arms of the far-leftist Sendero Luminoso, or Shining Path, guerrillas.

"The thrust of the American effort is to try to show that there is no security there and that the military is corrupt," the official said. "What they want is the opportunity to make {the valley} like Vietnam" and "kill everybody off."

Frank Shults, DEA public affairs director in Washington, declined to comment on the transcript or other intelligence reports. But U.S. officials said they had no plans to shut down or restrict DEA operations at the base.

"We are concerned about the possibility for compromise of our operations and we plan accordingly. We might go so far as putting out information that's not precise or that might even be a trial balloon to see how they scramble or react," Shults said, describing corruption allegations as going "very deep" in Peru. "But we have to still work within parameters. . . . That's part of the landscape we have to deal with."

In the past year, military corruption has become a key issue in U.S.-Peruvian relations, and some officials have warned it could jeopardize State Department "certification" of Peru as a country cooperating with U.S. anti-narcotics policy.

U.S. officials, including Assistant Secretary of State Melvyn Levitsky, have accused another former Peruvian commander in the valley, Gen. Alberto Arciniega, of interfering with U.S. anti-drug operations and promoting formation of a cooperative of coca growers. Arciniega is now a director of military affairs at the Defense Ministry in Lima, Peru's capital.

The tension stems, at least in part, from long-standing strains between the Peruvian military and police, officials said. While police working with DEA are stationed here to combat drugs, the military has been sent to fight the Shining Path, considered a far greater threat by most Peruvians.

The operations at this heavily fortified outpost -- protected by land mines, barbed wire fences and sandbags -- are considered pivotal to U.S. efforts in the Andean cocaine region. Rotating teams of 12 to 15 DEA agents and State Department contract pilots are stationed at the base, built last year at a cost of $1.2 million. The base provides a staging ground for helicopter-borne raids.

The Upper Huallaga Valley, a jungle about the size of Massachusetts, is considered a cradle of the world cocaine market. More than 200,000 peasants here grow enough coca to supply more than half of the U.S. cocaine market.

After a brief disruption last year, U.S. officials say, coca growing and trafficking flights of semi-processed coca paste have surged. This year's coca crop is projected to increase 10 percent, making it the largest ever.

The Upper Huallaga is a military emergency zone, allowing military commanders veto power over anti-drug raids. DEA agents and Peruvian police must give military commanders notice usually 24 to 48 hours before any raids, officials say.

Gene Bachman, the DEA team leader at the base, said the rules cause "a lot of difficulty for us," adding that "on occasions" DEA agents have arrived at laboratories only to find them dismantled and the traffickers gone. During a flight over the region, Bachman pointed with dismay toward a section of highway that had been broadened and turned into a makeshift airstrip less than a mile from a military base.

In the 14 months since DEA operations resumed here, no major traffickers have been arrested. U.S. officials have received periodic reports that some Peruvian military officers were collecting as much as $15,000 each to permit traffickers to land and take off at airstrips. Last April, DEA agents and Peruvian police were stoned by peasants during demonstrations led by military officers.

Anti-drug officials said the Nov. 8 meeting in Uchiza provided some of the first hard information of collusion between top army commanders and drug traffickers. A Peruvian source said representatives of more than 40 trafficking firms were at the meeting.

The next morning, a trafficker who uses the nickname "Chatuco" called a trafficker in Campanilla nicknamed "Toyota" to brief him on the meeting, according to the transcript. "There was a meeting here last night with all of the firms. . . . They made an agreement, I'm telling you," Chatuco said. "From today on, they are going to start attacking all of the places outside of Uchiza. . . . Starting today, they are going to start hitting Campanilla hard."

"It's been negotiated well," Chatuco added. "The general was there. The general has asked for a contribution from all of us, and every one has given something. . . . Everyone gave a luca." Police sources described a luca as a slang term for $1,000.

"I'm going to tell everybody that this is going to be coming down," Toyota replied.

During the conversation, Chatuco referred to a "big guy" and "two other generals and a colonel" as present at the meeting. At one point, he also appeared to suggest that the "DEA" was at the meeting. A U.S. official confirmed that a DEA agent had gone to Uchiza to brief army commanders, but said it was "absolutely not the case" that the agent met with traffickers.