Boston Red Sox star pitcher Roger Clemens and his brother, Gary, were charged yesterday with aggravated assault on a police officer after a skirmish in a West Houston nightclub, police said.

The Clemens brothers were released on third-degree felony charges after posting bond of $2,000 each, according to Houston police spokesman Dan Turner.

Sgt. C.J. Grysen said Roger Clemens, 28, who lives in Katy, about 25 miles west of Houston, and his brother, 39, were arrested at 1:30 a.m. yesterday after they allegedly wrestled with officers at the Bayou Mama's nightclub west of Houston's Galleria area.

"From what I can understand, Roger was involved in a disturbance -- a large argument was going on -- when the officer approached," Turner said.

Officer L. Oliedo was working off-duty as a security guard at the club and tried to break up the squabble, initially approaching Roger Clemens, Turner said.

"Then Gary, his brother, intervened and the officer tried to get him back," Turner said. "Gary pushed the officer at that time and the officer had to take his attention from the group. He attempted to arrest Gary Clemens, and Roger Clemens attempted to defend his brother."

Grysen said as the officer tried to arrest Gary Clemens, Roger Clemens apparently "jumped on the officer's back and choked the officer." Grysen said three more policemen -- another off-duty officer and two uniformed officers -- joined the fray before the brothers were subdued.

Oliedo was not seriously injured, Grysen said.