Story Highlights• Sources say a third rocket landed near U.N. post in Lebanon
• Hezbollah denies responsibility for attack
• Police: Rockets appear to have caused no casualties and only minor damage
• Attack marks first rockets to land in northern Israel since last summer
Adjust font size:
JERUSALEM (CNN) -- At least two Katyusha rockets fired from Lebanon landed near the northern Israeli town of Kiryat Shmona on Sunday, police and Israel Defense Forces said.
Lebanese security sources later reported that another rocket fired from Lebanon never made it across the Israeli border and landed near an observation post operated by the U.N. Interim Force in Lebanon.
A representative from the U.N. force called the attack a "serious violation of Security Council Resolution 1701 and of the cessation of the hostility agreement" that followed last year's war between Israel and Hezbollah militants.
"An investigation is under way," the representative said, asking all parties to "exercise maximum restraint."
All three missiles were launched using timing devices, and a fourth rocket failed to fire and is being dismantled by the Lebanese army, the sources said. (Watch the aftermath of the rocket attacks )
Hezbollah quickly denied responsibility for the attack, Lebanese security sources said.
A Lebanese security source told the Israeli newspaper, Haaretz, that suspected Palestinian gunmen carried out the attack.
There were no reports of casualties, police said. Only minor damage was reported.
Video from Israeli television showed a damaged car on the side of a road, it's front bumper crushed and windshield cracked.
The launch sites were in the eastern portion of southern Lebanon, near the town of Marjayoun, which is controlled by Lebanese forces who are monitoring the border after last summer's war between Israel and Hezbollah.
The rockets were the first to land in northern Israel since Kiryat Shmona was pounded by hundreds of Katyusha rockets during the 34-day war.
According to media reports, Kiryat Shmona Mayor Haim Barbivai told Israel's Channel 2 that he wanted to see a strong response from Israel and the Lebanese government.
"Heaven help us if we have another summer like the last one. That would be a tragedy," Barbivai told the television station.
CNN's Brent Sadler contributed to this report.