A Palestinian man died on Monday while working on a tunnel near Gaza's border with Egypt, Palestinian medical and security sources said.
The death brings to 10 the number of Gazans killed in three separate tunnel collapses in two weeks.
The man was killed "as a result of a collapse of a mass of sand" inside a tunnel previously used to smuggle goods, a security source said.
A medical source identified him as Mussa Jaber al-Maadi, 24 and from Rafah in the southern Gaza Strip.
Nine other Palestinians died in two unrelated tunnel collapses in the past two weeks, all of them members of the Al-Qassam Brigades -- the military wing of the Hamas.