Latvian President Andris Berzins has described the collapse of a supermarket roof in the capital Riga as "murder".

Mr Berzins called for foreign experts to investigate what happened and said many defenceless people had been killed. 

54 people have died since part of the roof collapsed on Thursday, and at least seven people are missing.

The last remaining section of the roof caved in yesterday evening, causing panic in the surrounding area.

Today is the second of three days of national mourning in Latvia remembering the victims of the worst disaster since the former Soviet republic gained independence in 1991.