A U.S. Army major was shot and seriously wounded near Fort Buchanan this morning by two men riding motorcycles in what appeared to be an act of political terrorism, according to the Army and local police. Unidentified callers to two news agencies claimed responsibility for the shooting on behalf of different Puerto Rican independence groups -- "Volunteers for Revolution in Puerto Rico" and "Los Macheteros," which is Spanish for "machete wielders." An FBI official here said the caller claiming to represent "Los Macheteros" told the Spanish news agency EFE that other U.S. soldiers "will fall in upcoming days." An Army spokesman at Fort Buchanan identified the victim as Maj. Michael S. Snyder, 37, of Columbus, Ohio, who works as executive officer of the U.S. Recruiting Battalion here. Police said Snyder was riding a motorscooter to work near the Army base at 7:50 a.m. when two men on motorcycles, one of whom had a .32-caliber pistol, pulled up beside him. Two shots were fired, one striking Snyder in the left hip, the other in the left side. He was taken to Veterans Hospital where he was listed in stable condition after surgery, according to the Army spokesman. Less than three hours later, the caller to EFE said the attack was "in reprisal" for Tuesday's visit to San Juan by FBI Director William H. Webster, who spoke at a judicial conference, according to an FBI agent. Picketers at the conference protested alleged FBI brutality in an Aug. 30 roundup of "Los Macheteros" members. The FBI arrested 13 members of the group in raids in Puerto Rico and Dallas, charging them with involvement in the September 1983 robbery of $7 million from a Wells Fargo depot in Hartford, Conn. "Los Macheteros" claimed responsibility for the robbery and for bombings and killings starting with the murder of a San Juan police officer in August 1978. The same group claimed responsibility for ambushing a Navy school bus in December 1979 in an attack that left two sailors dead and 10 wounded. Webster said after the August arrest that "Los Macheteros" is linked to the regime of Cuban President Fidel Castro. Filiberto Ojada, 52, described as the group's leader, reportedly spent years in Cuba. The Associated Press reported that a Spanish-speaking man claiming to represent the "Volunteers for Revolution in Puerto Rico" called the AP bureau in San Juan and said his organization was responsible for the Snyder shooting. That separatist group took credit for bombing a Navy recruiting office in Ponce last December, causing minor damage but no injuries. Staff writer Michael Weisskopf contributed to this report.