A spokesman for the US embassy in Haiti told NewsCore Sunday that 17 American citizens are confirmed to have been killed in Tuesday's earthquake.

The spokesman said that at least 70 Americans also remain unaccounted for.

"We have confirmation of 17 Americans dead and we have no way of knowing how many are missing," the spokesman said.

Up to 400 people have been sleeping inside the US embassy in Port-au-Prince each night.

The spokesman added that 2,000 US citizens have been evacuated.

Approximately half of the houses used by US embassy staff in Port-au-Prince have been destroyed.