The collision happened around 7:45 p.m. Two people involved have life threatening injuries, according to Montgomery County Fire and Rescue Services Assistant Chief Scott Graham.
Three more people involved had serious injuries and one had minor injuries, according to a tweet from Graham around 8:30 p.m.
Authorities were diverting westbound outer loop traffic to Georgia Avenue.
Photo via TrafficLand
A Philly bike courier takes his cat on cycling adventures. (Videos)
"Jenny from the Block" wants you to buy Verizon phones from her.
Clothes have a starring role at the Cannes Film Festival. (Photos)
Two brown bears rescued after 10 years in captivity.