Investigators have confirmed that the blast last week thatripped open a central Prague office building and injured some 40 people wascaused by a gas leak.
Police spokesman Jan Danek says the gas leaked from anunderground pipeline located several meters from the damaged building.
Danek didn't give further details on Thursday. He says theinvestigation has not been concluded but authorities believe it was anaccident.
The April 29 explosion badly damaged the building, whichbelongs to the Air Navigation Services of the Czech Republic. It shatteredwindows in the surrounding area, including the National Theater.
Six foreigners were among the injured.
Authorities had ruled out a terrorist attack.
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