North Korea has restarted a plutonium production reactor that could provide a stockpile for nuclear weapons, a US spy chief has said.

The widow of a former senior Islamic State leader is charged over the death of US hostage Kayla Mueller last year, the US justice department says.

Police have clashed with protesters in the Mong Kok district of Hong Kong during an operation to shut down illegal food stalls.

Former New York City Mayor Michael Bloomberg says he is considering running for US president, the first time he has confirmed he is eyeing a bid.

Indian scientists have been asked to examine claims that a man died after being hit by a meteorite in southern Vellore city.

Tokyo shares fall sharply on Tuesday, led by the banks, following the trends set in Europe and the US.

Two passenger trains collide head-on in the German state of Bavaria, with police saying at least four people have been killed and many others injured.

Police in Taiwan are questioning the developer of a building which collapsed in Saturday's earthquake, killing at least 39 people.