Gaza militants fired two more Qassams into Israel on Wednesday, defying a moratorium announced by Hamas on cross-border rocket fire for the second time this week.

The rockets struck an open area in the city of Sderot, causing no casualties.

Palestinian militants also fired two Qassams at Israel on Sunday. One rocket exploded in the southern Negev, while the fell short, exploding in the Gaza Strip.

The Israel Defense Forces Sunday identified a rocket fired by Gaza militants as a Russian-made S5K, the type used in battle in Iran and Afghanistan.

The IDF said it was the first time this type of weapon has been fired from the territory.

Hamas, the Islamist group that controls the Strip, last month announced that it has reached an agreement with other militant groups in Gaza to stop firing rockets at southern Israeli towns to prevent retaliatory attacks.