Two separate collisions on westbound Interstate 10 at Congress Street are slowing traffic for people hoping to attend Sunday night's All Souls parade downtown.
At 4:30 p.m., two vehicles collided in one accident with minor injuries, the Arizona Department of Public Safety said.
Around the same time, a motorcycle and passenger car crashed in another. There were minor injuries.
One lane of traffic remains closed for investigation.
Two people were taken to the hospital with injuries, Tucson Fire Capt. Barrett Baker said.
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