Rescue teams are searching among the rubble of a Latvian supermarket which collapsed and killed at least 50 people.
Fire trucks and ambulances remain at the Maxima shopping centre in the capital Riga, and rescue workers are using mechanical cutters and cranes to clear debris from the single-storey building.
Among the dead are three firefighters.
The roof of the supermarket collapsed at around 6pm on Thursday evening when the store was busy with shoppers on their way home from work.
Firefighters were injured by a second collapse shortly after their arrival on the scene.
People gathered to await news of the rescue operationIt is unclear how many people remain trapped in the ruined store but Latvian television has said it could be as many as 40.
"I don't know what happened to the cashiers - if you were sitting down, there is no way you could have got out in time," a witness named Jana told Latvia's LNT television.
The cause of the collapse has not been confirmed but police said a winter garden, involving large amounts of soil, was being built on the roof.
Soil, grass and parts of a new walkway can be seen dangling from the edges of the collapsed rooftop.
Rescuers have been periodically silencing their equipment and asking relatives to call their loved ones so anyone trapped can be pinpointed.
Rescue teams have been working slowly, fearing a further collapseWork is continuing slowly, as remaining sections of the roof are unstable and rescuers believe another collapse could occur.
"In the past hours no survivors have been found," said rescue service spokeswoman Viktorija Sembele on Friday morning.
Thirty eight people were injured in the collapse, according to latest police figures, and sniffer dogs are helping in the search.
More than 60 soldiers are also involved, the army said.
Visiting the scene, Prime Minister Valdis Dombrovskis said police had launched a criminal investigation into the cause of the incident.
Emergency services worked through the night but lost three of their ownCouncil official Juris Radzevics confirmed that the roof of the supermarket, built in 2011, was in the process of being turned into a green area.
"The project was submitted in accordance with all regulations but of course we will be looking at whether materials and works were carried out to the proper standards," Mr Radzevics told Latvian television.
Three days of mourning, starting on Saturday, have been announced as the country marks its worst accident since regaining independence in 1991.