The FBI yesterday arrested two Prince William County brothers and charged them with attempted murder in connnection with the Saturday morning sniper attack on a Marine who was shot while on patrol at the Quantico Marine Corps Base.

Brothers David A. Bendler, 30, and Marine Cpl. Carl Bendler, 25, who share an apartment in the 200 block of Fourth Avenue in Quantico, were taken into custody during separate arrests. David Bendler was arrested at the Marine base and Carl Bendler was arrested at his home. Both were charged with attempted murder on a government reservation and are being held in the Fairfax County Adult Detention Center in lieu of $200,000 bond, said FBI spokesman Al Hein.

The shooting victim, Lance Cpl. James C. Jaeger, 20, of Peoria, Ill., is in serious condition at Potomac hospital after doctors removed his left lung.

The suspects were arrested following an extensive federal and county investigation that determined that the brothers met at a Stafford County restaurant and then decided to "shoot up the (Marine) guard house as a lark," according to a statement issued by Lawrence Karl York, special agent-in-charge of the FBI's Northern Virginia office.

The attack came as Jaeger and another Marine were standing inside a small sentry post around 1 a.m. Saturday at the rear of the base, just east of Rte. 1, the FBI said.

Jaeger was hit in the left shoulder by a sniper bullet fired from a wooded area near the booth. The rifle fire was followed by two shotgun blasts that shattered glass.