Hamas gunmen continue to build attack tunnels into Israel, a senior leader of the Islamic militant group that rules Gaza has said.
Ismail Haniyeh said militants dig tunnels and test rockets to attack Israel "every day".
He spoke at the funeral of seven militants who died this week when a tunnel from Gaza to Israel collapsed while they were repairing it.
Hamas has built a sophisticated network of tunnels that it has used to penetrate Israel to carry out attacks on civilians and soldiers.
Israel destroyed dozens of the tunnels during the 2014 Gaza war.
Israeli media has reported that people living in communities near the border with Gaza have complained to authorities after hearing tunnelling sounds.