Three bomb alerts were issued in Belfast, hours before the arrival of US President George W. Bush for a summit on Iraq with Prime Minister Tony Blair .The first alert, at Belfast's international airport Monday, where Bush's plane was to arrive at around 6:00 pm (1700 GMT), was lifted after a search of the site. Two other alerts, one at Belfast's domestic City Airport, the other on a main route between the international airport and the town, were still in force, with part of the highway blocked off and police carrying out inquiries.

A terminal at the City Airport was evacuated as a precaution.

In their third summit in just over three weeks, Bush and Blair were set to discuss the Iraq war and the future of the country after the expected fall of President Saddam Hussein , as well as the Middle East and Northern Ireland peace processes.

Thousands of anti-war protesters were expected to demonstrate at Hillsborough Castle, the site south of Belfast where the leaders of Britain and the United States were to meet.

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Britain's Prime Minister Tony Blair (L) and US President George W. Bush . Three bomb alerts sounded hours before Bush's arrival in Belfast