Six Palestinians were reported trapped and another missing on Thursday following the collapse of a Gaza smuggling tunnel, according to a local civil defence official.
The civil defence official said the underground passage from southern Gaza town Rafah into neighbouring Egypt was a "trade tunnel".
Authorities received communication from one of the trapped men by mobile phone and rescue efforts are under way, he added.
Since January 26, 12 Gazans have been killed in five separate tunnel collapses.
Collapses have previously occurred in the strip, which is under a brutal Israeli blockade and has suffered on going bombing attacks from Israel since 2008. This cave-in is the sixth since the beginning of 2016.
During a 50-day assault by Israel in 2014, Israeli airtrikes targeted and destroyed a significant part of the underground network of tunnels used by Gazans.
Hamas has allegedly reconstructed tunnels following the 2014 conflict which Israeli officials claim could be used to carry out attacks.
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