At a news conference in Tel Aviv, Mattis also said that in recent days the Syrian Air Force has dispersed its combat aircraft. The implication is that Syria may be concerned about additional US strikes following the cruise missile attack earlier this month in retaliation for alleged Syrian use of sarin gas.
Mattis spoke alongside Israeli Defence Minister Avigdor Lieberman. "There can be no doubt in the international community's mind that Syria has retained chemical weapons in violation of its agreement and its statement that it had removed them all," said Mattis. He said he didn't want to elaborate on the amounts Syria has in order to avoid revealing sources of intelligence.
Israeli defence officials said this week that Syria still has up to three tons of chemical weapons in its possession. It was the first specific intelligence assessment of President Bashar Assad's weapons capabilities since a deadly chemical attack earlier this month.
Lieberman also refused to go into detail but said "We have 100 per cent information that (the) Assad regime used chemical weapons against rebels."
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In response to the April 4 attack, the United States fired 59 missiles at a Syrian air base it said was the launching pad for the attack.
Before meeting with Mattis in Jerusalem, Prime Minister Benjamin Netanyahu told reporters that Israel is encouraged by the change of administrations in Washington.
A few hours later sirens wailed on the Israeli held side of the Golan Heights warning of incoming rockets from Syria, the Israeli military said. It said three "projectiles" were fired and no injuries have been reported.
Israel has been largely unaffected by the Syrian civil war raging next door, suffering mostly sporadic, mostly spillover, incidents of fire. Israel has occasionally responded to fire with limited reprisals on Syrian positions.
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