The picture above is the result of bombings from Gaza on Sderot, Israel in 2006. This resulted in Operation Cast Lead, when Israel tried to halt the attacks coming from terrorists in Gaza.
Two of the targets were smuggling tunnels. They were destroyed. Gazans have been wanting cement. They would use it to build these tunnels.
Mortar fire from Gaza came from the Popular Resistance Committees, a Palestinian militant group. They say this was caused by Israel killing two of their militant leaders of al-Qaeda which is linked to the Army of Islam in Gaza.Four Gazans were injured in the attack. None were killed. In one case, a person was injured from the building that was hit.