(Adds further details, ambulance service comment)
By Aija Braslina
RIGA, Nov 21 (Reuters) - Four people were killed and dozens more were feared trapped after the roof of a busy supermarket in Latvia's capital Riga collapsed on Thursday evening, a rescue official said.
TV pictures showed the Maxima grocery store surrounded by fire trucks and ambulances with rescue workers using their hands and crow-bars to pull away rubble from inside the single storey, modern building.
"Around 30 people are injured, there are four people dead, including one rescue service worker," rescue service spokeswoman Inga Vetere said.
The cause of the collapse was not known, but local media said workers had been building a roof garden on the store.
Ambulance service spokeswoman Ilze Buksa, said 27 people had been injured and 22 of those had been taken to hospital.
"There might be more injured, but we can't give an estimate as rescue works are ongoing," she said.
Vetere said rescue workers called to the store, situated among grey, Soviet-era housing in a suburb of the capital, after the roof collapsed had been caught by a second cave-in.
Local media reported that seven firemen were among those injured in the collapse, which happened at around 6 pm local time (1700 GMT) as many people were shopping on the way home from work.
Riga's deputy mayor Andris Ameriks said on television that 50 people were trapped. Rescue services said this was only a rough estimate.
"It is very hard to tell because it is a shop and there are many people in the shop at that time of day," Vetere said.
Soldiers had been called in to help with the rescue efforts and police dogs were looking for survivors, she said.
Local media reported that the Maxima supermarket, estimated at around 500 square meters (5,380 square feet) in size, had been awarded an architecture prize when it was completed in 2011. (Reporting by Aija Braslina; Editing by Alistair Scrutton and Ralph Boulton)
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