LANSING, Mich. (AP) — The Michigan Capitol building was temporarily closed Thursday after a man called to make a bomb threat.

The call came at 6:40 a.m., a day after a violent mob stormed the U.S. Capitol in an attempt to overturn the presidential election. State police cleared employees to return by 9 a.m. after conducting a sweep.

Lawmakers are not convening until next week. Legislative leaders and some other legislators have offices in the statehouse. The building is closed to the public except during session days due to coronavirus restrictions.

State police spokeswoman Shanon Banner said the threat remained under investigation.

“Every effort will be made to identify the person who made this threat and prosecute them to the fullest extent the law will allow,” she said.