Authorities say two bicyclists are dead and a pickup driver arrested after his truck slammed into a group of riders waiting for a red light in the northern Tucson area.

The Pima County Sheriff's office says three cyclists were also injured in the crash Thursday afternoon.

Most of the bicyclists are members of Santa Fe Seniors on Bikes from New Mexico, according to a report in Tucson's Arizona Daily Star.

The sheriff's office says the 28-year-old driver, Brian Lynch, was arrested on suspicion of driving under the influence, and faces various manslaughter and aggravated assault charges.

About 10 bicyclists were in the group that was waiting in a designated bike lane on La Canada Drive at Hardy Road when the crash occurred.

Officials say 72-year old Clare Rhodes died at the scene, while 68-year-old Kenneth Vieira died at the hospital. One cyclist is in critical condition; two others suffered minor injuries.