Protesters in Israel demanding the government make a deal to secure the release of hostages held by militants in Gaza escalated their campaign on Sunday, staging a nationwide strike that blocked traffic and closed businesses.

Protesters, who fear further fighting could endanger the 50 hostages believed to remain in Gaza, only about 20 of whom are thought to be alive, chanted: “We don’t win a war over the bodies of hostages.”

The protesters gathered at dozens of points throughout Israel, including outside politicians’ homes, military headquarters and on major highways.