A Gaza man was killed Monday after a cross-border smuggling tunnel collapsed on him, Palestinian officials said. The Gaza Health Ministry says five more people were wounded in Monday's collapse and one is still missing. Security officials say the tunnel was under construction at the time. Such collapses are common along the Gaza Strip's border with Egypt. Smuggling tunnels in the area have become an important route for goods and a lucrative business. Palestinian smugglers use the tunnels to move weapons and contraband into Gaza, Israel and Egypt are blockading the territory in an attempt to weaken the Hamas government and end ongoing rocket fire at Israeli towns. The blockade has increased demand for smuggled goods.