Operation was part of a push by the government to tackle illegal migration, along with new rules for companies to verify workers’ immigration status

British authorities arrested almost one in five people they checked in a week-long crackdown on migrants working illegally as delivery riders last month, the government’s interior ministry said on Saturday.

Immigration enforcement officers stopped and questioned 1,780 individuals between July 20 and 27 and 280 people were arrested, the interior ministry said, adding asylum support was being reviewed for 53 of those detained.

The operation was part of a push by the government to tackle illegal migration, which also includes new legal requirements for companies to verify workers’ immigration status.

Prime Minister Keir Starmer is facing pressure to show voters he can counter illegal immigration, with support rising for Brexit campaigner Nigel Farage’s Reform UK party.