UK police say truck victims from Vietnam; 3 suspects held

Britain’s Prime Minister Boris Johnson lays flowers during a visit to Thurrock Council Offices, England, Monday Oct. 28, 2019. British police say they have arrested a fourth person in connection with the deaths of 39 people found in a truck in southeast England in one of Britain’s worst human-smuggling tragedies. (Stefan Rousseau/Pool via AP)

This undated photo issued on Tuesday Oct. 29, 2019 by Essex Police shows Ronan Hughes, right, and his brother Christopher Hughes from Northern Ireland, as the investigation widens into the deaths of 39 people who were found in truck container in southeastern England. Both are wanted on suspicion of manslaughter and human trafficking. (Essex Police via AP)

Floral tributes at the Waterglade Industrial Park in Thurrock, Essex, England Thursday Oct. 24, 2019 the day after 39 bodies were found inside a truck on the industrial estate. British media are reporting that the 39 people found dead in the back of a truck in southeastern England were Chinese citizens. (Stefan Rousseau, PA via AP)

LONDON — All 39 people found dead in a refrigerated container truck in England last week were Vietnamese nationals, British police said, as three more people were arrested in Ireland and Vietnam in the sprawling international investigation into what appears to be a people-smuggling tragedy.