Homeland Security Secretary Jeh Johnson said Thursday that there’s “no specific credible threat” against Friday’s inauguration, but that authorities are taking extraordinary precautions anyway.

He said security was being beefed up to prevent truck attacks like the Bastille Day assault in Nice, France, that killed 86 people in July.

Johnson said authorities are especially wary of the “self-radicalized actor, the so-called lone wolf.”

As a result, he said, areas where vehicles are prohibited will be “extra fortified this year with dump trucks, heavily armored vehicles to prevent anybody who’s not authorized from being in the area from driving something in there.”

Up to a million people are expected to attend the event, and thousands are also in town for women’s protest march on Saturday. Authorities want to ensure that the demonstrations don’t turn violent.

The US Capitol Police Department was securing the Capitol — site of the inauguration — and Washington’s Metropolitan Police Department was protecting the parade route.

In addition, more than 3,000 cops from across the country are on patrol in the nation’s captital, as are National Guard troops.