Two buses, one carrying children to school in suburban Virginia and the other a Metrobus carrying domestic workers to their jobs in Montgomery County, were rammed by other vehicles yesterday in separate accidents.

A total of 20 passengers were taken to local hospitals as a result of the accidents. All were treated for minor injuries and released.

In Montgomery County, 17 Metrobus passengers were taken to Suburban Hospital, most of them for treatment for neck injuries, after their bus was rammed from behind by a dump truck, which itself was hit from behind by a trash truck.

According to police and bus passengers, the Metrobus, driven by John Wesley Armstrong, 32, was slowing down to let passenger Maria Cecilia Morales off on Bradley Boulevard, near the intersection of Howell Road, when the trash truck, driven by Michael Terry Dotson, 26, of Mount Airy, came over the crest of the hill and careered into the dump truck.

The dump truck driven by Edwin Eugene Zimmerman Jr., 21, of Mount Airy, was pushed into the rear of the bus, police said. At the same time, the trash truck swerved left and plowed through a fence before coming to a stop.

Dotson, the trash-truck-driver, was trapped in the cab of his truck for 15 or 20 minutes, witnesses said, before the Bethesda-Chevy Chase rescue squad could cut him free. However, he suffered only a minor leg injury.

Dotson was charged by police with failing to reduce his speed.

In the other accident, three school children from Commonwealth Christian School in Fairfax received minor injuries yesterday morning when their school bus collided with an automobile, that failed to stop at a stop sign, Fairfax County Police reported.

Paul D. Brenton, 72, of 7102 Playdon Ct., was charged with driving while intoxicated after the car he was driving hit the school bus at the intersection of Old Keene Mill Road and Huntsman Boulevard, shortly after 11 a.m., police said. Twelve children were on the bus.

School authorities said the children, who were treated at Fairfax Hospital and released, required "just Band Aids."