According to police, at least seven people were killed in an explosion at a gas station in a small village in northwest Ireland on Saturday.

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Four people were confirmed dead overnight by Irish police, adding to the initial toll of three from Friday's explosion in Creeslough, County Donegal.

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After a blast ripped through the Applegreen service station in the 400-person community, eight people are in hospitals and several are missing.

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"The search and recovery for additional fatalities continues," said An Garda Siochana, the Irish police force. The cause of the explosion is being investigated.

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Emergency personnel from Ireland and neighbouring Northern Ireland have been called in to assist in what police described as a "search and recovery" operation.

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The explosion destroyed the gas station building, which houses the village's main shop and post office, and damaged an adjacent residential building.

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According to the prime minister, it was one of the "darkest days for Donegal and the entire country."

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"People all over this island will feel the same sense of shock and utter devastation as the people of Creeslough as a result of this tragic loss of life," Martin said.

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Because of its prominent location on the main N56 road, the service station was known throughout the country as "the heart" of the local community.

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