Armenian Americans protested on the highway near 3rd Street.
Road cameras show traffic jams for a while while police remain on the scene. The roadway has since reopened.
The peaceful demonstration began earlier in the day near the Philadelphia Museum of Art.
The protest is linked to the ongoing conflict between Armenians and Azerbaijanis, who are fighting for the Nagorno-Karabakh mountain enclave.
Azerbaijan and Armenia have agreed on a “humanitarian ceasefire” in the conflict over the disputed enclave on Saturday ̵
The new agreement – scheduled to begin at midnight local time (4pm Saturday to Saturday) – was announced after both sides accused each other earlier in the day of attacks violating Moscow’s mediation weekly agreement.
The dispute dates back to the collapse of the Soviet Union, when Nagorno-Karabakh declared independence from Azerbaijan, sparking a violent conflict that ended in a shaky ceasefire in 1994.
Armenia backed Nagorno-Karabakh, which has established de facto independence that is not recognized by much of the world. Although located in Azerbaijan, the region is populated and controlled by ethnic Armenians.
Armenia said the current arson is between Karabakh and Azerbaijan.
Russian Foreign Minister Sergei Lavrov spoke with Azerbaijani and Armenian counterparts by telephone on Saturday to stress the need for a truce, according to the Russian Foreign Ministry.
Araik Harutyunyan, leader of the disputed region, welcomed the new peace efforts, saying in a statement: “The Artsakh Republic reaffirms its readiness to abide by the humanitarian truce on a reciprocal basis, in line with the ceasefire agreements reached by Moscow on Saturday and one week ago. .
Nagorno-Karabakh is called Artsakh by the Armenians.
Ahead of the latest ceasefire attempt on Saturday, Azerbaijan accused Armenia of a rocket attack on the second-largest city of Ganja, killing at least 13 civilians – including three children – and injuring more than 50 others.
Azerbaijani President Ilham Aliyev called the missile strike a “cowardly shelling” that “cannot break the will of the Azerbaijani people.”
The attack took place in the early hours of Saturday morning and was aimed at civilian neighborhoods in the central part of the city, the Azerbaijani prosecutor’s office said in a statement.
Adviser to Azerbaijani President Hikmet Hadjiev accused Armenia of using ballistic missiles in the attack and said authorities had evidence to support the claim, according to a Twitter post.
“Let the international community see Armenia’s barbaric actions against civilians,” Hadjiev added.
Videos and photos allegedly on the scene show rescuers clearing debris to reach survivors. Prosecutors said officers were compiling a complete list of victims.
Another temporary ceasefire fell apart last weekend after temporary fighting, with both sides trading in allegations of violating the agreement amid reports of casualties.
CNN contributed to this report.
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