RICHMOND —Virginia police are investigating threatening e-mail sent to Attorney General Ken Cuccinelli II.

Cuccinelli, the Republican candidate for governor, called police in April after receiving a threat against him and his family. State police and Virginia Capitol police obtained a search warrant for a house in Michigan, his office said Thursday.

“No arrest has been made in this matter and the investigation remains ongoing,” said Corinne N. Geller, state police spokeswoman.

NBC Washington first reported the threat.

“Nothing is more important to parents than the safety of their children,” Cuccinelli said in a statement issued by his office. “And like any parent, I take a threat to my children seriously.”