At least five New York Police Department dump trucks and a bus have been filmed parked outside Trump Tower in Midtown, New York City with thousands of police "at the ready" for whatever unfolds on election night.
Access has also been blocked to the streets surrounding Trump Tower in Chicago.
CBS reports the Wabash Ave bridge near Trump Tower was raised about 6.15pm on Tuesday (US time) as a precaution, "in anticipation of possible civil unrest".
Office of Emergency Management and Communications spokeswoman Mary May told the Chicago Sun Times it was shut down "as part of a precautionary measure to ensure the safety of residents".