LONDON (AP) — British Prime Minister Boris Johnson says the death of 39 people whose bodies were found in the back of a truck is an "unimaginable tragedy and truly heartbreaking."

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Johnson told lawmakers in the House of Commons that he is receiving regular updates on the case.

Britain's interior minister, Priti Patel, is due to update lawmakers on the tragedy later.

Police say the bodies of 38 adults and a teenager were found early Wednesday in a truck in Gray's, east of London. The vehicle had traveled from Bulgaria to the U.K. by way of Ireland.

Detectives say they have not yet identified the victims.

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