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Druze women mourn the death of relatives, Thaer Mahmoud and Nazeah Mahmoud, two brothers who were killed in an Israeli airstrike on Sunday after the Israeli military said they were seen carrying a bomb near the border, in the Druze village of Majdal Shams, near the border with Syria, Israeli-controlled Golan Heights, Monday, April 27, 2015. The military said it carried out the strike after troops saw a group of men approach the border with an explosive intended to target Israeli troops. (AP Photo/Ariel Schalit) Image Credit: AP

Occupied Jerusalem: Two mortar rounds fired from Syria struck open areas of the Israeli-occupied sector of the Golan Heights on Tuesday, an Israeli security source said.

“Two mortar shells fell in the northern sector of the [occupied] Golan Heights,” the source said, saying it was a result of stray fire from fighting inside Syria and had caused no casualties or damage.

The Israeli army said that “multiple explosions” were heard in the occupied Golan Heights and that sirens had sounded in several areas.

The mortar fire came two days after the regime’s military said the air force had targeted four “terrorists” armed with explosives who were “en route to carry out an imminent attack” on troops on the armistice line.

All four were killed.

Several hours later, in the early hours of Monday morning, there were reports of a strike on missile batteries in the Qalamun area near the Syria-Lebanon border, which were attributed to Israel.

Although the army declined to comment, an Israeli security source said he was “not aware of any unusual [Israeli] activity in Syria overnight” saying it was believed to be related to the ongoing civil war.

In another incident at the weekend, reports emerged early Saturday of a strike on Syrian army weapons storage facilities along the border with Lebanon, which was also blamed on Israel.

The regime’s army refused to comment.

Israel occupied 1,200 square kilometres of the Golan Heights in the Six-Day War of 1967 and later annexed it in a move never recognised by the international community.

Since the Syrian conflict erupted in 2011, the plateau has been tense, with a growing number of rockets and mortar rounds hitting the Israeli side, mostly stray, prompting occasional armed responses.