The brother of Colin Zwolinski, a Briton believed to have died with his wife Fiona in the Bali bomb blasts, has flown out from his home in Edgehill, near Banbury, to be with the couple's sons.

Mr Zwolinski, the manager of a mining company in Newcastle, Australia, and Mrs Zwolinski, a nurse, were on holiday with sons Isaac, 17, and Ben, 14, when the bombs went off on Saturday.

They were having dinner at the Nyoman Cafe on Jimbaran Beach with other families who had coordinated their trips so their sons, all pupils at St Francis Xavier College, in Newcastle, could spend their holidays together.

Isaac and Ben had ret- urned to the hotel when the blasts ripped through both Jimbaran and Kuta.

Kevin Zwolinski, who lives at Edgecombe, Edgehill, and runs Banbury management consultancy Click On Logistics, is currently at the couple's Australian home, awaiting further news.

Officials are waiting for the results of DNA tests to confirm the couple's identities.

A spokesman for Mr Zwolinski's company, Tunnel Mining, said: "At this moment, we do not have formal confirmation of Colin and Fiona's death, although we are expecting the worst.

"We will provide a press release if or when we have confirmation. Fortunately, their children are safe and back home in Newcastle."

Mr Zwolinski is the only UK national thought to have died in the attack, which police believe was carried out by radical group Jemaah Islamiah.

One of his colleagues said: "Colin was a man of boundless energy.

"Our company is something Colin built up with plain hard work. He knew all the staff and he knew everything the company was doing, back to front.

"The boys just need as much support as they can now, so everybody will be doing what they can to give them that."

A total of 19 people, plus the three bombers, are known to have been killed when the bombs exploded in tourist areas within moments of each other.

Officials have released a list of 25 people who are unaccounted for, including 12 Indonesians, two Americans, two Japanese and two Danes.

The Foreign Office has already confirmed two Britons were injured, one slightly and one seriously. The latter, a woman who has dual British and Australian citizenship, was flown to Australia for treatment.

The Foreign Office sent a rapid response team to the area to search hospitals and ensure no more Britons were involved.

The team has also been liaising with the hundreds of UK holidaymakers on the island, to check travellers are safe, brief them on the situation, and help if they want to return home early.