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Montgomery County police are searching for an aggressive driver who allegedly harassed a group of cyclists on River Road, forcing one of them into a ditch and landing her in critical condition.

The cyclists - who are members of the Potomac Pedalers club - describe a terrifying scene.

According to the cyclists, they were riding in single file when an SUV driver harassed and yelled obscenities at them before finally swerving in front of the lead rider, forcing her off the road.

The police say they are aware of the incident and they're actively investigating.

They're urging anyone who may have seen the incident to contact them.