U.S. President Barack Obama said Monday the United States had no precise intelligence warning of the Paris bombing and shooting attacks that have been claimed by Islamic State jihadists.

The United States has agreed to speed up its sharing of military intelligence with France to try to avert such assaults, the U.S. leader added in a news conference after a summit in Turkey.

Russian President Vladimir Putin on Monday said that the attacks in Paris showed the need for his proposal for an international anti-terror coalition to be realized.

"I think that not only we are able, but it is also indispensable" to form an international anti-terrorist coalition, Putin told reporters after the G20 summit in the Turkish resort of Antalya.

Turkish President Recep Tayyip Erdogan on Monday hailed the "resolute stance" against terror adopted by world leaders at a summit in Turkey dominated by the Paris attacks.

"G20 Leaders agreed to show our resolute stance in the fight against terrorism," Erdogan said after two days of talks between leaders of the world's top 20 economies in the Turkish Mediterranean resort of Antalya, adding that the "strong position" against terror was one of the most important outcomes of the summit.

The rector of the Great Mosque of Paris called Monday on all French imams to lead the faithful in Friday prayers for the victims of the country's worst ever terror attacks.

"I appeal to imams to take part in a solemn prayer to show our compassion and share in the families' sorrow," rector Dalil Boubakeur told reporters.

Boko Haram Islamists have destroyed an estimated 1,100 schools this year in their stronghold region surrounding Lake Chad, the United Nations envoy to the area, Toby Lanzer, said Monday. 

Lanzer, who became the U.N. envoy to central Africa's restive Sahel region in July, said the targeted schools were in Cameroon, Chad, Niger and Nigeria, the four countries most affected by the extremist uprising.

Serbian police have detained a migrant holding a Syrian passport with the same data as one found by police at a Paris attack scene, the Blic newspaper reported Monday.

A Syrian passport in the name of Ahmad Al Mohammad was found at the Stade de France football stadium near the body of one of three suicide attackers at the sports venue Friday.

World leaders on Monday sought to join forces to bring peace to Syria and destroy the Islamic State jihadist network, hoping to curb the extremist menace after the Paris attacks.

Leaders of the Group of 20 top economies meeting in Turkey will describe the Paris gun and bombing strikes as an "unacceptable affront to all humanity", according to a draft statement obtained by AFP.

Turkish warplanes carried out a new wave of air strikes against Kurdistan Workers' Party (PKK) militants in the southeast, killing 13 rebels overnight, the army said Monday. 

"Thirteen terrorists have been neutralized," in the remote Hakkari province, on the border with Iraq, the general staff said in a statement on its website.

CIA director John Brennan warned Monday that the attacks in Paris were likely not a "one off event" and that he expects the Islamic State group has more operations in the pipeline.

"Security and intelligence services right now are working feverishly to see what else they can do in terms of uncovering it," he said at a Washington think tank.

Belgium on Monday charged two people with involvement in terrorism after they were arrested over the Paris attacks, as a major police operation in Brussels failed to nab a key suspect.

The charges came as French President Francois Hollande said that Friday's attacks in which 129 people were killed were planned in Syria but launched from Belgium, with French help.