ROUGH CUT (NO REPORTER NARRATION)<br/> <br />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.<br/> <br />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.<br/> <br />"Around 30 people are injured, there are four people dead, including one rescue service worker," rescue service spokeswoman Inga Vetere said.<br/> <br />The cause of the collapse was not known, but local media said workers had been building a roof garden on the store.<br/> <br />Ambulance service spokeswoman Ilze Buksa, said 27 people had been injured and 22 of those had been taken to hospital.<br/> <br />"There might be more injured, but we can't give an estimate as rescue works are ongoing," she said.<br/> <br />Vetere said rescue workers called to the store, situated among gre
