Turkey's interior minister resigned on Wednesday, the second in the cabinet to step down over an anti-graft probe that has roiled the government of Prime Minister Recept Tayyip Erdogan, local media reported.

The news of Muammer Guler's resignation broke just minutes after Economy Minister Zafer Caglayan said he was stepping down. The sons of both men are among two dozen people who have been charged as part of a high-level bribery and corruption probe that has hit Erdogan with the biggest challenge yet to his 11 years in power.