FILE - In this May 16, 2106 file-pool photo, Fayez al-Sarraj, the head of the U.N.-brokered presidency council, attends a news conference in Vienna, Austria. The U.S. launched multiple airstrikes against Islamic State militants Monday, Aug. 1, 2016, opening a new, more persistent front against the group at the request of the UN-backed Libyan government, Libyan and U.S. officials said. Serraj, said in a televised statement that American warplanes attacked the IS bastion of Sirte. No U.S. ground forces will be deployed, he said. (Leonhard Foeger/Pool Photo via AP, File)
FILE - In this May 16, 2106 file-pool photo, Fayez al-Sarraj, the head of the U.N.-brokered presidency council, attends a news conference in Vienna, Austria. The U.S. launched multiple airstrikes against Islamic State militants Monday, Aug. 1, 2016, opening a new, more persistent front against the group at the request of the UN-backed Libyan government, Libyan and U.S. officials said. Serraj, said in a televised statement that American warplanes attacked the IS bastion of Sirte. No U.S. ground forces will be deployed, he said. (Leonhard Foeger/Pool Photo via AP, File) Credit: Leonhard Foeger

Washington — The United States launched multiple airstrikes against Islamic State militants in Libya on Monday, opening a new, more persistent front against the group at the request of the United Nations-backed government, Libyan and U.S. officials said.

Fayez Serraj, the head of Libya’s U.N.-brokered presidency council, said in a televised statement that American warplanes attacked the ISIL bastion of Sirte on the Mediterranean in northern Libya. No U.S. ground forces will be deployed, he said.

The precision strikes, which targeted an Islamic State tank and vehicles, come amid growing concerns about the group’s increased threat to Europe and its ability to inspire attacks across the region, even though its numbers have been shrinking because of attacks from local forces and allied international troops.

“The presidency council, as the general army commander, has made a request for direct U.S. support to carry out specific airstrikes,” Serraj said. “The first strikes started today in positions in Sirte, causing major casualties.”

The strikes mark the start of a more intense American role in the fight against ISIL in Libya, as the U.S. steps in to assist the fragile, U.N.-backed government. They were the first strikes by the U.S. on the group in Libya since February, and they are expected to continue. But officials said they expect the air campaign will last weeks, not months.

President Obama’s authorization for action in Sirte covers strikes, intelligence and surveillance, but not ground operations, according to a White House official, who wasn’t authorized to speak publicly about the strikes and requested anonymity.

Serraj said his government is joining the coalition against ISIL, adding, “This is the time for the international community to live up to its promises to the Libyan people.”

He also noted that the strikes will not go beyond Sirte and its surroundings. He said any other foreign intervention is not allowed without coordination.

His warning comes after several French commandos were killed fighting Islamic State militants. U.S., French, British and Italian special operations forces and military experts have been assisting Libyan troops fighting ISIL militants in eastern and western Libya.

Pentagon press secretary Peter Cook said Obama authorized the strikes following a recommendation from Defense Secretary Ash Carter and Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff.

Cook told reporters that U.S. Africa Command will coordinate any strikes with the Libyans and that the new air campaign will last as long as the Libyans request assistance to eliminate ISIL from Sirte. The U.S. is also providing airborne surveillance and intelligence.