Demonstrators are laying flowers and lighting candles in front of a building in the Ukrainian city of Odessa where more than 40 people died as it caught fire in a clash between supporters and opponents of Ukraine's government.

In all, 48 people died in Odessa in the May 2, 2014, violence. It began with fights between two factions marching in the city and reached a grisly culmination at the trade union building, where supporters of autonomy for Ukraine's heavily Russian east took shelter from government backers.

The government supporters threw firebombs at the building, which caught fire. However, official accounts say those who took shelter in the building could have set it on fire by throwing firebombs from the roof at their opponents. Forty-three people died in the building.