Sudanese government delegates have arrived in Ethiopia for African Union-mediated peace talks with rebels aimed at stopping civil war, AU officials said Tuesday.

Rebel factions from the war-torn western Darfur region as well as the Sudan People's Liberation Movement-North (SPLM-N), fighting the government in the southern Blue Nile and South Kordofan states since 2011, are due to attend.

A French jihadist named Fabien Clain made the audio recording of the Islamic State group statement claiming the Paris attacks that was published online, a source close to the investigation told AFP.

The 35-year-old is a veteran of radical Islamist networks in the southern French city of Toulouse and was close to Mohamed Merah who shot dead seven people, including three Jewish children, in 2012.

British police on Tuesday said they had detained two men for terrorism offenses as they tried to leave the country, adding that the arrests were not linked to attacks in Paris.

Police said the men, aged 22 and 20, were arrested early on Sunday at Dover Eastern Docks, a ferry terminal in southeast England and a popular departure point for ships heading to the port city of Calais, France.

Iran's army conducted exercises Tuesday close to its border with Afghanistan designed to simulate how it would respond if "terrorist groups" such as the Islamic State organization mounted an attack.

The operation in the northeastern province of Khorasan came a day after a military commander said IS would be "neutralized" if it breached a 40 kilometer (25 mile) zone approaching Iran's borders.

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.