Four people — two motorcyclists and a passenger on each motorcycle — were injured Saturday afternoon during a breast cancer benefit ride in Windham.

Windham police said the crash occurred on River Road when the two motorcycles were slowing in traffic and the drivers and passengers were thrown to the pavement. About 120 motorcyclists were taking part in the benefit ride, police said.

Police said some of the injuries are considered critical. The identities of the injured were not released Saturday, so their conditions could not be obtained from local hospitals.

A press release from Windham police said that while speed was not considered a factor in the crash, charges may be filed.

A dispatcher for the Cumberland County Sheriff’s office, which handles calls for Windham police on weekends, said no other information would be released Saturday.

Edward D. Murphy can be contacted at 791-6465 or at: [email protected]