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The BBC's Jon Donnison reports from a street destroyed by "a wall of water"
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Typhoon Haiyan
Co-ordination vital
UK sends ship
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US and British vessels were heading to the Philippines as the UN appealed for aid amid the large-scale devastation caused by Typhoon Haiyan.
The US has deployed an aircraft carrier and navy ships, while the UK is sending a naval destroyer.
At least 10,000 people are feared to have been killed and thousands of survivors desperately require aid - but reports say little is getting through.
Philippine President Benigno Aquino has declared a state of national calamity.
In a statement, he said the two worst affected provinces, Leyte and Samar, had suffered massive destruction and loss of life.
A huge international relief effort is under way, but rescue workers have struggled to reach areas cut off since the storm.
Bernard Kerblat, who is overseeing the UNHCR response to the crisis, said some aircraft had landed in Cebu but distributing aid was difficult because of bad weather and damaged infrastructure.
"The rain is further complicating the effort for light vehicles, including trucks, to penetrate in areas wherever there's still a bridge left intact.
"The other bad news is that within the next 72 hours, we should see the arrival of yet another typhoon."
Two typhoon victims walk a road surrounded by a devastated land outside the airport in Tacloban, on the eastern island of Leyte on 12 November 2013
Large parts of the Philippines have been devastated by Typhoon Haiyan
A woman holding a baby comforts a crying relative as a plane leaves the airport during evacuation operations in Tacloban, on the eastern island of Leyte on 12 November 2013
In Tacloban, Leyte, hundreds have