More bad weather has been forecast for Thursday.

The BBC's Colin Blane reports from Athens

Residents in the worst hit areas spent the night in tents or under sun shades in parks and squares. The government said camps would be set up for the homeless.

More than 2,000 are now said to be injured, with over 50 thought to be still trapped under the rubble.

Outdoor shelter

Many families continued to spend the night in the open, many in canvas tents set up by the army.

A sniffer dog at work in the debris of a building in the Athens suburb of Nea Philadelphia

International help has been quick to arrive, especially from Turkey, reciprocating the Greek aid after last month's disastrous quake.

More than 30 were buried at one factory. On Wednesday three survivors had been located, but fire crews were not hopeful that many more would be pulled out alive.

Two thousand people have been treated for injuries, but only about 25 are described as being in a critical condition.

The BBC's Caroline Wyatt: "Dozens of people still unaccounted for"

A team of 600 inspectors has been assessing the state of buildings affected by the earthquake, and it is thought that many could be condemned, leaving thousands homeless.

Aftershocks

According to the environment ministry, of the 2,000 homes so far examined, 30% were inhabitable, 42% needed repairs, and 28% would have to be demolished.

More than 700 aftershocks shook Athens on Tuesday night, some as high as 4.7 on the Richter scale. The original quake measured 5.9.

The Prime Minister, Costas Simitis, visited one of the factories where rescue attempts were in progress. He ordered that tents which had been bound for Turkey be distributed among the Greeks who needed them.

On Wednesday, many shops remained closed and all schools in Athens were closed as people dealt with family emergencies.

The government said homeless families would be put up in hotels and given 200,000 drachmas ($650) each in emergency aid.