Palestinian sources report that armed groups in northern Gaza have detained hundreds of men suspected of belonging to Hamas.
The local militias, said to be hostile to Hamas, handed the detainees over to the Israel Defence Forces for interrogation.
Israeli officials are to confirm the exact number of suspects, but sources indicate the figure is in the hundreds.
The move highlights growing fractures inside Gaza, where rival armed groups are distancing themselves from Hamas amid the ongoing war.
The IDF is currently questioning the suspects as part of wider operations against Hamas infrastructure.
