After two grinding decades of combating Islamist terror, America is split asunder, divided not just on how to defeat the Islamic State, but on the magnitude of the threat the group poses.

Gone is the grief-fueled solidarity that flowed seamlessly in the immediate aftermath of the 9/11 attacks.

Even if the Islamic State group is one day defeated on its territory, the world could face an even greater threat from tens of thousands of battle-hardened jihadist veterans, experts have warned.

U.S. intelligence services estimate some 30,000 people have joined the ranks of IS from around 100 countries, adding to the huge number that have fought with older Islamic extremist groups over the decades.  

An agreement towards ending strife-torn Libya's long political crisis has been hailed as a breakthrough but does not address key issues and will struggle to win approval, analysts and lawmakers say.

A deal to end years of political deadlock is seen as crucial to restoring stability in the oil-rich North African nation and to tackling the rising threat from the Islamic State jihadist group.

Government forces and rebels in Sudan's war-torn border regions say they are preparing for another bout of fighting after the latest talks in Addis Ababa failed to reach a deal.

The African Union-mediated talks ended last month without a temporary ceasefire being agreed in Darfur, mired in conflict since 2003, and South Kordofan and Blue Nile states, where rebels have been battling since 2011.

With dust from the California massacre barely settled, the killings are sharpening the U.S. political divide over gun control and spurring attacks on President Barack Obama's counter-terrorism strategy.

As Obama prepared to address the nation on his plans to keep Americans safe and defeat IS, Republican foes lined up on the Sunday talk shows to attack his leadership.

Iraq's premier wants Washington's assistance against the Islamic State group, but American remarks about anti-jihadist efforts and Iran-allied organizations' strong opposition to U.S. combat troops put him in a bind.

Trying to navigate the political minefield, Haider al-Abadi has issued increasingly strident statements about foreign forces over the past week, most recently saying the deployment of such "ground combat forces (is) a hostile act."

The Islamic State group has built a base in Libya from which to exploit tribal conflicts and expand across Africa, though experts say the jihadists remain vulnerable even if the West's attention is elsewhere.

Libya's collapse into a chaotic mess of competing militias since the overthrow and death of dictator Moammar Gadhafi has made it an ideal stomping ground for IS.

There will be plenty of prayers in the wake of the latest mass shooting in the United States, but little concrete action on gun control is expected from lawmakers, despite pressure from Americans weary of the violence.

Fourteen people were killed and 21 others injured in Wednesday's shooting rampage at a social services center in San Bernardino, California that ended with the two suspects, a married couple, dead in a wild firefight with police.

Britain will bring extra precision firepower to the Syria air campaign but its participation will be no game-changer, according to experts who questioned the effectiveness of coalition air strikes in the war-torn country.

Following the green light from lawmakers Wednesday for strikes on Syria, a total of 16 Royal Air Force warplanes will be available to bomb Islamic State (IS) group targets in Syria.

An electrifying speech on Syria air strikes by the foreign affairs spokesman of Britain's Labor party brought together rival MPs in an emotional display but shone a spotlight on the opposition's deep divisions.

The House of Commons fell silent as Hilary Benn implored MPs to approve the government's plan for air strikes on Islamic State jihadists in Syria, to which his party leader Jeremy Corbyn is opposed.