German police arrested two men on Tuesday and carried out 22 searches in a crackdown on human trafficking that authorities say helped illegally secure asylum approvals for at least 10 migrants, mostly from Iran.

“We are investigating at 10 cases and the number could grow, perhaps substantially,” said Oliver Eisenhauer, a state prosecutor for the state of Lower Saxony.

He said four more people, including an Iranian man employed at Germany’s embassy in Iran, were being investigated as possible co-conspirators, but no arrest warrants had been issued.

The two men were arrested in the northern city of Hannover.

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