GAZA CITY, Gaza Strip ? A shadowy Palestinian militant group on Tuesday said it has abducted two alleged collaborators with Israel.

The announcement by the group calling itself the “Knights of the Storm” was latest sign of chaos and lawlessness in the Gaza Strip following Israel’s withdrawal from the area last month. The group said it abducted the two men in the southern town of Khan Younis on Monday after Palestinian officials refused demands to arrest them.

The gunmen said they are affiliated with Palestinian leader Mahmoud Abbas’ Fatah faction, which controls the Palestinian Authority.

One of the militants, identifying himself as Abu Anan, said late Tuesday that the group’s interrogation had determined that the two hostages, whom they did not identify, were part of a network of collaborators with Israel.

During more than four years of fighting with Israel, militants have executed dozens of alleged collaborators, often based on evidence gathered during hasty interrogations.