The former head of Israel's Military Intelligence, Amos Yadlin, said Thursday that the attack attributed to Israel in Syria was "not a routine" incident.

"The facility at Masyaf produces chemical weapons and explosive barrels that have killed thousands of Syrian civilians," Yadlin said in the tweet.

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The Israeli military struck Thursday a chemical arms plant in in Syria, foreign media reports claimed. The Syrian army general command confirmed in a statement the attack on what they called a military facility, and said that two people were killed and that extensive damage was caused. Israel refused to comment on the reports.

According to the former Air Force general and current head of the INSS think tank, the targeted site is a Syrian military science development and manufacturing center where among other things, precision missiles and other weaponry are made.

Yadlin said "the attack is an Israeli moral statement about the massacre in Syria," he said.

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Syrian opposition members claimed that four Israeli warplanes were involved in the strike, which would be the first since a ceasefire was reached between the Assad regime and Syrian rebels in July.

Israel allegedly targeted the Scientific Researchers Center, a plant involved with the development of chemical weapons, near the city of Masyaf in central Syria, reports said. By early Thursday, smoke could still be seen billowing over the area.

The war monitor, the Syrian Observatory for Human Rights, said the strikes hit a Scientific Studies and Research Centre facility, the agency the U.S. describes as Syria's chemical weapons manufacturer.