Bosnian police on Tuesday arrested three Muslim men for war crimes against ethnic Serb civilians during the country's 1990s conflict when they were serving as police and army commanders, a prosecutor said.

Two of those arrested -- Esef Huric and Ibro Merkez -- are suspected of involvement in the detention of about 100 ethnic Serbs in "inhumane conditions" in the eastern region of Gorazde, said a statement from Bosnia's prosecutor for war crimes.

French warplanes pounded Islamic State targets and Russia vowed to ramp up its bombing campaign in Syria on Tuesday as the devastating attacks on Paris galvanized international resolve to destroy the jihadists and end the Syrian war.

In a grieving Paris, U.S. Secretary of State John Kerry said a "big transition" in Syria was probably only weeks away as he expressed solidarity with the French nation after IS gunmen and suicide bombers massacred 129 people in the capital on Friday night.

The Great Mosque of Paris urged French Muslims on Tuesday to gather at the country's most important mosque Friday to say "No to terror" and "We are all Paris!".

A statement called on "all Muslim citizens and their friends" to gather at 2:00 pm (1300 GMT) to say "no to terror" and voice "their deep attachment to Paris, its diversity and the values of the Republic."

A jihadist leader in restive Mali has denounced a peace deal signed this year and called for further attacks against France, which helps national forces fight extremists, according to a recording authenticated Monday.

In the recording released in October, before Friday's string of deadly attacks in Paris, Ansar Dine leader Iyad Ag Ghaly endorsed the attack on the Charlie Hebdo magazine in the French capital last January. The satirical weekly "got what it deserved", he said.

The United Nations on Tuesday called on states not to "backtrack" on pledges made to host migrants and refugees, including from Syria, in the wake of the attacks in Paris. 

"We are concerned about the reactions from some states to end programs being put in place, backtracking from commitments made to manage the refugee crisis," said U.N. refugee agency spokeswoman Melissa Fleming.

A strong earthquake registering 6.0 on the Richter scale struck the Greek island of Lefkada Tuesday, killing two people and damaging roads and buildings, local authorities said.

A woman in her sixties was killed by a falling rock caused by a landslide on her house in the village of Ponti Vassilikis, the island's deputy mayor Christos Kaliforis told Vima radio.

European Union defense ministers on Tuesday unanimously backed France's request for help with military missions in the wake of the Paris attacks, EU foreign policy chief Federica Mogherini said.

"France has requested aid and assistance in accordance with article 42-7. It's an article that has never been used before in the history of our union," Mogherini said, referring to part of the EU treaties that provides for solidarity of member states in the event one of them is attacked.

At least eight people drowned when a boat carrying migrants from Turkey sank off the Greek island of Kos, the coastguard said Tuesday.

They were the latest of nearly 3,500 deaths at sea this year among people making desperate bids to flee war and poverty and to reach Europe, according to U.N. figures.

Kosovo's opposition fired tear gas and pepper spray in parliament Tuesday while protesters outside threw stones and paint, in the latest eruption of a long-running protest against agreements made with Serbia.

Opposition MPs have been paralyzing parliamentary sessions for weeks in a bid to thwart EU-brokered dialogue and agreements with Serbia, the country from which Kosovo broke away and declared independence in 2008.

Five Tanzanian gold miners have been rescued after spending 41 trapped deep underground eating cockroaches and frogs to survive, the mining ministry and survivors said Tuesday.

The miners were among a group of around 20 that were in pit when a shaft they were working on collapsed on October 5.