A relative of a British child believed killed in the terror attacks on a shopping mall in Kenya has spoken of her shock as the Government said it believed six Britons were dead.

Louis Bawa, of Leamington Spa, Warwickshire, is understood to have lost his daughter Jenah, eight, and Kenyan-born wife Zahira, in the attacks which have left more than 60 dead. Responsibility for the attack as been claimed by al-Shabab - an Islamist group based in neighbouring Somalia with links to al Qaida

Earlier, Prime Minister David Cameron chaired a Cobra meeting to review the situation and said reports now indicated six British casualties. Following the meeting in the Cabinet Office, Defence Secretary Philip Hammond said final confirmation on the sixth casualty's nationality was still needed but warned the British death toll could rise.

Relatives of Mr Bawa said both he and his daughter were born in Britain, but his wife was originally from Kenya and met her husband while studying in the UK. They said Mr Bawa was also currently living in Kenya but was not at the mall when the attack occurred.

Speaking at her home in Leamington Spa, Warwickshire, Mr Bawa's aunt, Shakuntla Bawa, said he was in deep shock at the deaths of his wife and daughter.

Mrs Bawa, who was informed of the deaths by a relative on Sunday, said: "We can't believe it... They are a very nice family, very lovely. I saw them about five or six years ago before (Zahira) went back to Nairobi."

It is understood Mr Bawa's brother, who still lives in Leamington Spa, has flown to Kenya to assist him. Mrs Bawa added: "Everybody who knew them is shocked. He was born here, but after his daughter was born they moved to Kenya when she was only about one or one-and-a-half."

Writing on Twitter after the Whitehall meeting, Mr Cameron said: "I've just chaired a meeting of Cobra. Tragically the latest reports are that six British nationals have been killed in the Kenya terror attacks."

When asked about reports that Britons may have been involved in the execution of the attack at the Westgate complex, Mr Hammond replied: "I've seen those reports but there's no evidence to support those claims." Earlier, a Twitter account purporting to belong to an al-Shabab spokesman named a 24-year-old man from London as one of the gunmen. The Foreign Office had said earlier it was investigating suggestions that British terrorist suspect Samantha Lewthwaite - known as the "White Widow" - was among the attackers.

The Kenyan authorities have said that 62 civilians have now been confirmed dead while 65 people were being treated in hospital.