A mudslide has blocked the outbound lane of the East Busway near the 26th Street ramp, Port Authority officials reported.
The slide occurred around 2:20 p.m. on the busway, between the Penn and Herron stations.
Traffic will be diverted around the slide into the inbound lane. Emergency responders were still determining the severity of the slide, Port Authority spokesman Jim Ritchie said, causing the lane to be closed indefinitely.
He said the slide will cause minimal delays for commuters during the afternoon rush hour.