A suicide bomber has killed four security officers and injured five others near one of Islam's holiest sites in the Saudi city of Medina, according to the interior ministry.

The Iraqi government has declared three days of national mourning after a huge bomb in the capital Baghdad killed at least 125 people and wounded about 150.

Twenty people, all of them foreigners, were killed during an attack by suspected Islamists on a cafe in Bangladesh, officials say.

Researchers say they have found the first clear evidence that the thinning in the ozone layer above Antarctica is starting to heal.

A black box recording from crashed EgyptAir flight MS804 confirms smoke on board, Egyptian investigators say.

A gun and bomb attack on Istanbul's Ataturk international airport has killed 36 people and injured more than 140, officials say.