Four rockets were fired from Syria on Tuesday afternoon, two of which exploded in open areas of Israel's Golan Heights. The Israel Defense Forces responded with artillery fire, and identified a hit on the source of the rockets.

Officials assume that the rocket attack was a joint effort by Hezbollah and the forces of Syrian President Bashar al-Assad, in the wake of the recent airstrike in Syria.

The IDF earlier was investigating whether the rockets were fired intentionally or were spillover from the civil war in Syria.

Lebanese sources said that the rockets were fired toward a rebel-run field hospital in the village of Jubhata al-Khashab in the Quneitra province of the Syrian Golan.

The 107mm rockets were fired from a distance of about 7 kilometers (4.3 miles). The source was identified as a Syrian position, and the IDF's return fire made a direct hit.

Sirens sounded in the Golan towns and villages of Odem, Al-Roum, Bukata, Majdal Shams, Masa'da, Neve Atib, Nimrod and Ein Kanya. Residents reporting hearing explosions. There were no injuries in Israel.

Tourists were evacuated from the Hermon ski resort after the sirens were sounded. Israel Police spokesman Micky Rosenfeld said that roadblocks had been erected in the Golan Heights to prevent traffic from entering.

This was the first cross-border incident between Israel and Syria since an attack on Quneitra two weeks ago killed an Iranian general and six Hezbollah operatives.

The army has installed concrete blocks on the Lebanon border as part of defense efforts following the airstrike in Syria last week that the foreign media has attributed to Israel.

According to a military source, the blocks were deployed amid concerns of possible shooting attacks. The army has also beefed up infantry, artillery and armored forces in the area.

Also, the air force has been ready to react more quickly since the attack in Syria. Iron Dome anti-missile batteries were reportedly deployed in the north, as well.

Early Sunday evening, the army noticed suspicious movements on the Lebanese side of the border near the Ramim Ridge, in the northeast. It briefly closed a number of roads in the area.