Two men, including a son of a Bethesda clergyman, were killed and a third was injured when the car they were in swerved off a secluded stretch of Piney Meetinghouse Road in Potomac and slammed into a tree early yesterday, Montgomery County police said.

Christopher A. Rados, 19, of Potomac, whose father is pastor of St. Peter & Paul Antiochian Orthodox Christian Church in Bethesda, was a backseat passenger in a Ford Escort driven by Colin E. Agostini, 22, of 10100 Chariot Ct. in Rockville.

A brother of the driver, Sean Agostini, who turned 18 yesterday, suffered a elbow fracture in the 1 a.m. crash and was in fair condition at Suburban Hospital in Bethesda. He and Rados were June graduates of Winston Churchill High School in Potomac.

Officer Wayne Jerman said Sean Agostini told rescuers that the three had "had some drinks" at the Agostini house before leaving in Sean Agostini's car to drive Rados to his home, eight miles away in Potomac, where he lived with his mother and father, the Very Rev. George M. Rados.

Beyond Agostini's statement, Jerman said, police had no evidence yesterday that the crash was alcohol-related.

None of the three was wearing a seat belt, police spokeswoman Cathie Sterling said.

They were about halfway between the Agostini family's spacious, year-old brickfront house and the Rados family's older brick house at 8500 Buckhannon Dr. when Colin Agostini apparently lost control of the car, which traveled about 80 feet through brush along the road before slamming into a tree.

A passing motorist spotted the wreck about 10 minutes later, heard Sean Agostini calling for help, and called the police, Jerman said.

Jerman said he believed excessive speed contributed to the crash, but he declined to estimate how fast the car was traveling.

At the Agostini home, another brother, Ivor, said his parents brought the family to America from Barbados about 10 years ago. An office worker at Winston Churchill High School said Sean Agostini and Christopher Rados were both "excellent students, A-B students."