The Islamic State group claimed to have seized full control Tuesday of the Libyan city of Sirte from the Fajr Libya militia, including a power plant, according to a U.S. monitor.

SITE Intelligence Group said the jihadist group had published photographs of "IS fighters engaged in clashes, sitting atop heavy guns, exploring the power plant and town, as well as bodies of dead Fajr Libya fighters."

Libya's warring factions have reacted positively to a draft peace agreement, the U.N. envoy said Tuesday, as they head for talks in Berlin with world powers anxious for an end to the conflict.

Libya descended into chaos after a 2011 NATO-backed uprising toppled and killed veteran dictator Moammar Gadhafi, with heavily armed former rebels carving out fiefdoms across the country.

More than 100,000 people have crossed the Mediterranean to Europe so far this year, the United Nations said Tuesday in what it called a "dramatic increase" in arrivals.

Since the beginning of the year, 103,000 refugees and migrants have risked their lives often on flimsy boats to reach Europe, the U.N. refugee agency said.

Libya's warring factions meet for a new round of "decisive" talks Monday as the U.N. scrambles for a peace deal before the start of the Muslim holy month of Ramadan next week.

Amid warnings the oil producer is on the verge of collapsing into a failed state, United Nations envoy Bernardino Leon is pushing for an agreement before the June 17 start of Ramadan.

Algeria, Egypt and Italy on Sunday called for a political solution in Libya, on the eve of U.N.-mediated talks aimed at forming a unity government in the war-torn country.

Libya plunged into chaos after a 2011 NATO-backed uprising toppled and killed veteran strongman Moammar Gadhafi, with heavily armed former rebels carving out their own fiefdoms across the country.

An international military intervention is needed to end unrest in Libya, where the Islamic State group is gaining a foothold, Spanish Defense Minister Pedro Morenes said in an interview published Saturday.

"We went to Afghanistan to stop all of that from coming here, we are in Iraq, Mali or Somalia with the same objective. And now we have it nearby. Something may need to be done," he told the top-selling Spanish daily El Pais when asked if there would be a military intervention in Libya.

Russia and China on Friday opposed a U.S.-led request to impose sanctions on two Libyans accused of obstructing U.N. talks on forming a national unity government, diplomats said.

Britain, France, Spain and the United States had sought the measures to shore up efforts by U.N. envoy Bernardino Leon to clinch a political deal before the start of Ramadan on June 17.

Britain, France, Spain and the United States are seeking U.N. sanctions against two Libyans accused of obstructing United Nations talks on forming a national unity government, diplomats said Thursday.

The request came as U.N. envoy Bernardino Leon is scrambling to clinch a deal on a national unity government before the start of Ramadan on June 17, with a new crucial round of talks opening in Rabat on Monday.

More than 500 illegal migrants who had hoped to set off at dawn on Thursday for a new life in Europe were arrested in the Libyan capital, officials said.

Acting on a tip-off, authorities stormed a hideout where the migrants were waiting for people smugglers to take them to boats, migration officials said.

The EU's foreign policy chief held "constructive" talks Wednesday with Libya's foreign minister, focused on a European naval force that would fight people smuggling gangs organizing Mediterranean migrant crossings but so far opposed by Tripoli.

Libya's ambassador to the United Nations said Tuesday that his government is refusing to give consent for U.N. action aimed at endorsing the plan because European governments had discussed it with Libyan militias that control coastal territory.