The US Secret Service has placed the White House on lockdown after they found a suspicious package at the complex, reports say.

Axar.az reports that the Secret Service found the package near the White House on Tuesday. Roads around the White House were closed off and staff and media people were barred from entering the building.

".SecretService investigating suspicious package near WhiteHouse grounds. Road closures in effect," the agency tweeted.

The Secret Service said that it had established a "security perimeter" and was moving reporters and the public to a safe distance.

The lockdown comes after a series of security breaches. This is the second time alarms have been raised at the White House this month.

On March 10, an intruder reportedly spent more than 15 minutes on the White House grounds before eventually being captured.

It was not the first time that a person entered the White House grounds. In one instance in September 2014, an Army veteran carrying a knife, climbed the fence and made it through the north portico doors, while the first family was not at the White House.