Kuwait is observing a day of mourning after 27 people died in an attack on a Shia mosque during Friday prayers.

Another 227 people were wounded in the Imam Sadiq Mosque in the capital Kuwait City. Images circulating online show bodies on the floor amid debris.

An Islamic State-affiliated group said it was behind the attack. IS has carried out similar recent attacks in neighbouring Saudi Arabia and Yemen.

However, this is the first attack on a Shia mosque to take place in Kuwait.

A spokesman for the Kuwait National Petroleum Company said security was being stepped up at oil installations around the country in the wake of the bombing.

The interior ministry said police have detained several suspects for questioning, AFP news agency reports.