BRUSSELS, Feb. 22 (Xinhua) -- Greece failed to reply to the European Union (EU) by Friday on its alleged collusion with Wall Street banks to reduce deficit figures because of strikes, the European Commission said on Monday.

"Eurostat has received some information, but not all relevant information yet from Greek authorities, and of course we expect to receive it very soon," commission spokesman Amadeu Altafaj said at a daily press conference in Brussels.

"The Greek authorities told us the delay is partly due to the four-day strike which has also affected the finance ministry," he added.

Greece's Prime Minister George Papandreou delivers a speech during an economic conference in Athens February 2, 2010. Greece said on Tuesday its fiscal problems were also an issue for the whole of the euro zone, warning other members may fall prey to what its leaders called an "uNPRecedented" attack by speculators

The EU demanded Athens to explain by Friday after the New York Times and Financial Times reported that major Wall Street investment banks, including Goldman Sachs, had helped Greece as early as in 2001 hide its overshooting deficits from the EU through complex financial operations.

The Greek government had said the schemes were legal at that time.