(CNN) -- Latvian Prime Minister Valdis Dombrovskis is resigning in the wake of a deadly supermarket roof collapse, his spokesman said Wednesday.
Dombrovskis is "taking political responsibility for the tragedy," spokesman Martin Punke told CNN.
The roof collapse last Thursday in the capital, Riga, left at least 51 people dead -- the deadliest incident in Latvia since the country became independent in 1991.
Dombrovskis, who has been prime minister since March 2009, is expected to address the nation in a news conference Wednesday afternoon.
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