A tunnel collapsed on Tuesday in the central-southern area of the Gaza Strip, killing two members of Hamas's military branch, an official statement from the group said on Wednesday.
Sources in Gaza reported the collapse in the Nusayrat refugee camp to Ynet on Tuesday, but officials would initially neither confirm nor deny this.
The IDF sent a message to the settlements' representatives that the working assumption, as has been published, is that Hamas is digging attack tunnels and continues to prepare for the possibility of escalation.
Despite the recurring claims of residents in the Gaza vicinity of suspicious noises heard from deep underground, so far no offensive tunnel has been discovered in Israeli territory since Operation Protective Edge.