Washington (CNN) A suspect from Salisbury, North Carolina carrying an assault rifle is in custody after he allegedly walked inside a popular pizzeria in Washington DC Sunday afternoon, Metropolitan Police spokeswoman Aquita Brown told CNN.

DC Police have not released his name and said they do not have a motive.

No one was injured, police have said. Police have found at least one shell casing and are investigating whether the weapon was discharged, Brown told CNN. There is "some evidence the weapon was fired" into the ground, interim DC Police Chief Peter Newsham told reporters.

DC police responding to reports of an armed suspect at Comet Ping Pong, a pizza restaurant on Connecticut Avenue in Washington, DC, detained a man with an assault rifle earlier this afternoon.

While the motive is not known, the restaurant, Comet Ping Pong, its owner, James Alefantis and some employees of the restaurant were threatened last month after fake news reports -- shortly before Election Day -- charged Hillary Clinton and her campaign chairman John Podesta were involved in a child sex operation at the restaurant. The fake stories continued to proliferate online as Alefantis kept denying the charges.

Patrons inside the restaurant ran out when the suspect entered. Patrons inside the restaurant ran out when the suspect entered.

Read More