The protest—organized by IfNotNow, which describes itself as “a movement of American Jews organizing our community to end U.S. support for Israel’s apartheid system and demand equality, justice, and a thriving future for all Palestinians and Israelis”—began at 8 a.m. and soon closed down the Boston University Bridge.

The protest, organized by IfNotNow​, began during rush hour Thursday and soon closed down the Boston University Bridge.