The Clinton campaign office of Prince George's County Executive Lawrence J. Hogan, who is seeking the Republican nomination to the U.S. Senate, was burglarized Tuesday night or early yesterday, according to reports.

An electric typewriter, a cassette tape recorder and some campaign papers were reported stolen.

Hogan campaign manager Charles Michael Hoback said the office, in the Surratt professional building at 9015 Woodyard Rd., was entered between 11 p.m. Tuesday, when he closed it for the night, and 8:15 a.m yesterday, when he returned. Hoback said he didn't know how the office had been entered and county police refused to comment on the means of entry.

"We're rather concerned about this, to say the least," said Hoback. Hogan could not be reached for comment. His son and aide, Lawrence J. Hogan Jr., said, "All I can say is, most of the things they took were not valuable, or rather, they were documents that were valuable to the campaign."

Hoback would not identify the documents that were removed, saying only that they were "opposition research files" and letters in progress that were on top of and in the typewriter that was taken. Hoback said these were "political organization letters," not fund-raising documents.

"They left some very valuable equipment," he said. "The petty cash fund was not tampered with. One tape recorder was taken and the two next to it weren't touched. They took a $500 typewriter and left a $1,700 electronic typewriter sitting there. The police said they seemed to know what they were doing and what they were looking for."