Hamas has executed more than 30 Gazan Palestinians accused of collaborating with Israel, according to Palestinian news sources.

Hamas reportedly captured dozens of suspected collaborators in the Shejaiya neighborhood of Gaza City last week during battles with Israeli soldiers. The accused collaborators were executed after a short investigation, the Times of Israel reported, citing a Palestine Press News Agency report on Monday.

The suspects were found with SIM cards from an Israeli cell phone company, according to the report.

Collaborators have been accused of signaling to Israeli military aircrafts to show them what homes they should target.

Israel’s Channel 10 reported Tuesday that 20 Palestinians who participated in an anti-war protest in Gaza were executed Monday ostensibly for collaborating with Israel. It is not known if these 20 were part of the reported 30 collaborators who were executed.