All flights in Pakistan have been suspended after a string of bomb warnings at airports across the country.

The country's civil aviation authority is said to have instituted a state of emergency.

Benazir Bhutto International Airport has been evacuated after a phone call saying the building would be blown up.

Sky's Asia correspondent Alex Crawford said there had been at least two separate threats, and the country was in a state of "high anxiety".

She said the first threat came in a call to Pakistan International Airline's call centre.

The second threat was made to the media warning of attacks at airports across the country.

Earlier, the group claiming responsibility for a bomb attack on the Marriott Hotel in the capital warned of more attacks.

Saturday's truck bombing left 53 people dead and more than 260 wounded.

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