Albanian prosecutors have issued a series of arrest warrants on charges including murder and abuse of office over the deaths of 51 people killed when a 6.4-magnitude earthquake toppled dozens of buildings last month, police said on Saturday.

Axar.az reports citing Reuters.

Police and prosecutors said initial investigations showed “the loss of life in the collapsed buildings came also because their builders, engineers and owners had failed to observe the rules, norms and standards of safe constructions.”

Prosecutors issued 17 warrants in total, police said. Two of the nine people detained on Saturday on murder charges were the owners of two hotels that collapsed, killing four people in Durres, Albania’s second-biggest city and main port.

A third was the manager of a police vacation hotel where a high-ranking police officer was killed under the rubble.