Security at Leeds Bradford Inter-national Airport has been heightened following the threat of a missile attack in London.

Armed West Yorkshire Police officers have surrounded the outside of the airport and are patrolling the terminal building. An armoured vehicle as parked outside the airport entrance.

The move comes as Heathrow was put on high alert after the Metropolitan Police received a terrorist threat.

Although no threats have been made on the Yeadon airport, West Yorkshire Police have increased security.

A police spokesman said: "In line with increased vigilance nationally around airport safety and security West Yorkshire Police has taken reasonable measures to tighten security in the area surrounding Leeds Bradford Airport and within the terminal itself to provide public reassurance. There has been no threats made in West Yorkshire but all appropriate steps have been taken."

The Department of Transport has issued a warning to all the United Kingdom's airports.

A spokesman said: "We have given appropriate security advice to all the United Kingdom's airports. We cannot comment on the advice for security reasons. That is all we can say."

Traveller and businessman David Wright from Wakefield said: "I travel a lot on business here and have not seen it like this before, I think it's quite tense. There were three armed guards when I came in, but I suppose they are there to protect us, so it's good that there is a lot of them."

Claire Murdock, from Pudsey, who was waiting for her friend, said: "It is a bit scary, but I feel safer knowing they are there."

Emma Brown from Heckmondwike, was travelling to Ireland with two friends, said: "I didn't really think anything of it, my friend had to put his seat belt on when he was driving towards the airport, apart from that, everything was normal."

More than 1,000 extra police were drafted into Heathrow this week along with 450 troops in armoured vehicles.

The security increase was authorised by Prime Minister Tony Blair following intelligence warnings amid fears that the Al-Qa'ida network could use the end of the Muslim festival of Eid, which ends on Saturday, as a trigger for an attack.

It follows the airing of an audio tape of Osama Bin Laden urging Iraqis to carry out suicide attacks against Americans