World News Update, What you need to know

At least one person has opened fire in the Southern California city of San Bernardino, and early reports say there are as many as 20 victims.

ELSEWHERE:

MEXICO CITY - The Mexican girlfriend of missing Australian surfer Adam Coleman says "it's a 99-per-cent probability" two bodies found in their burned-out van are her boyfriend and his friend Dean Lucas.

BANGKOK - Thai police could charge an American man and a Thai woman over the kidnapping and murder of a former Australian Hells Angels bikie whose body was found in a shallow grave in eastern Thailand.

LONDON - Britain's parliament looks set to vote in favour of joining the bombing campaign against the Islamic State group in Syria, despite growing doubts among the public and some MPs.

KABUL - Afghan Taliban leader Mullah Akhtar Mansour has been injured in a firefight following a verbal dispute at a meeting of militant commanders in Pakistan, officials say, exposing the deep divisions within the fractious militant movement.

WASHINGTON - Donald Trump has extended his lead in the Republican's US presidential nomination race amid a fresh bout of controversy over his remarks about Muslims, while Hillary Clinton has consolidated her lead among Democrats, a poll shows.

WASHINGTON - Mark Zuckerberg's pledge to give away his Facebook holdings is the latest philanthropic initiative by America's wealthy, and follows a challenge by billionaire Warren Buffett to the world's other billionaires.