Reports suggest that one collapse was in Gaza City, while the other was near the city of Khan Yunis.
Khalil al-Dimyati, 32, and Yusef Abu Abed, 22, were named as the two members of the terror group who died.
Since Israel unilaterally withdrew from the Gaza Strip in 2005, Hamas has built a sophisticated network of concrete-reinforced terror tunnels to infiltrate into Israel.
Over 160 Gazans have been killed while digging Hamas terror tunnels into Israel and Egypt, at least nine of whom were children. A number of Palestinians have died after falling into one of the tunnels, including a one-year-old baby in March 2012, and dozens of Hamas fighters have died in tunnel collapses.
During Operation Protective Edge in 2014, Israel detected and destroyed 32 of Hamas’s terror tunnels.
In June 2017, the United Nations Relief and Works Agency (UNRWA) for Palestinian refugees uncovered a Hamas-built tunnel under a boys’ primary school in the Gaza Strip.