Suspected militants have attacked a luxury hotel complex in Nairobi, killing a number of people.

Gunfire and blasts were heard at the compound in the Westlands district of the Kenyan capital, which houses the DusitD2 hotel as well as offices.

The Somalia-based militant group al-Shabab said it was behind the attack but gave no details.

People - some with bullet wounds and covered in blood - were escorted out of the building by heavily armed police.

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The attack began at about 15:00 local time (12:00 GMT). The gunmen threw bombs at vehicles in the car park before entering the lobby, where one blew himself up, Kenyan police chief Joseph Boinnet told reporters.

A woman working in a neighbouring building told Reuters news agency: "I just started hearing gunshots, and then started seeing people running away raising their hands up and some were entering the bank to hide for their lives."

Police then rushed to the scene. One officer told the BBC's Ferdinand Omondi at the scene: "Things are not good. People are dying."

Mr Boinnet later said most of main building had been secured, but police were still working to flush out any surviving gunmen.

The number of victims remains unclear. One photographer for Agence France-Presse reported five bodies slumped over tables on a restaurant terrace in the complex.

The five-star DusitD2 hotel has 101 rooms. Located in the Westlands suburb, minutes from the capital's business district, it has its own spa and several restaurants.

Kenya has seen a number of terror attacks in recent years - most notably in areas close to the Somali border and in the country's capital.