A Syrian rights group claimed Monday that Israel's overnight strikes on targets in the country killed "at least ten" Syrian soldiers.The UK-based Syrian Observatory for Human Rights was quoted as saying that nine missiles were fired by Israeli aircraft and at least two tanks and two batteries of artillery were destroyed. "At least 10 members of the Syrian army were killed," said Rami Abdurrahman from the Syrian Observatory for Human Rights.Syrian President Bashar Assad's regime has not responded to the airstrikes which Israel launched early Monday morning in retaliation to a cross-border missile attack which killed a 13-year-old Israeli boy on Sunday.Israeli jets and artillery "Tamuz" missiles struck nine targets belonging to the Syrian military early on Monday.The targets included command posts and Syrian firing positions, the IDF said. "We identified accurate strikes on the targets," it added. Defense Minister Moshe Ya'alon said Monday that the Assad regime is responsible for Sunday's cross-border missile attack."We see the regime of Bashar Assad and the Syrian military as responsible for what occurs in the territory under their control, and we will respond aggressively and harshly against any provocation and violation of our sovereignty," Ya'alon said in a statement. Yaakov Lappin and Reuters contributed to this report.