Killer in Attack Outside CIA Is Still at Large : Fugitive: Police sift 250 telephone tips, set up roadblocks in hunt for gunman who murdered 2 and wounded 3 workers.

WASHINGTON — Police set up a roadblock outside CIA headquarters Tuesday and questioned motorists about the gunman who killed two of the spy agency’s employees and wounded three other men who were on their way to work Monday.

But the killer remained at large despite descriptions from motorists, tips from about 250 telephone callers and a CIA-supplied list of possibly disgruntled employees and agency contractors.

The dark, curly-haired gunman left his car in the left-turn lane outside the entrance Monday morning, walked between two rows of cars stopped at a red light and opened fire at point blank range. Police said he used a weapon resembling an AK-47 assault rifle.

He then returned to his car and sped away.

Police said they had little doubt that he deliberately targeted CIA employees in choosing the spot outside the agency’s wooded complex in suburban Virginia, 13 miles across the Potomac from the nation’s capital.

Fairfax County police official David Franklin said at a news conference Tuesday that police had not ruled out any theory, including one that it was a lone professional hit man who did the shootings.

“Everything remains a possibility,” including the hit man theory and others, such as vendettas against the spy agency, he said.

The FBI said it had joined the hunt for the gunman.

“Wherever the investigation takes us, we will go,” Frank Scafidi, a spokesman for the FBI’s Washington field office, said in a telephone interview.

Police who set up the roadblock outside the headquarters found 30 additional witnesses Tuesday. Some described the gunman for police sketch artists.

The gunman was identified only as a young man, possibly with dark, curly hair and a dark complexion.

“We have a lot of leads but we have nothing confirmed as far as a suspect,” Franklin said. “We would certainly appreciate any additional information or tips that anyone out there might have.”

The CIA identified those killed as Frank Darling, 28, and Lansing H. Bennett, 66, both of Reston, Va.

Police in Fairfax County, which includes the CIA grounds, said they were working from a CIA-supplied list of people with a possible grudge against the spy agency.

“The CIA has provided some names of employees who may have been disgruntled,” said Jackie Volmer, a police spokeswoman. “Those names are still under investigation. We’re not calling them suspects, just persons of interest.”

The CIA has released little other information about the attack or the victims except to say in a written statement that employees were “shocked and saddened at the senseless attack on our friends and colleagues.”

R. James Woolsey, President Clinton’s nominee to become the agency’s next director, said he knew “what a sense of sorrow and frustration CIA employees must feel.”

Acting CIA Director Vice Adm. William Studeman told agency employees Monday that security around the compound would be increased.