Police are investigating a potential attack plot at the Pennsylvania Convention Center in Philadelphia, first reported by CNN affiliate WPVI.
“Police got a tip about a group, possibly a family, driving up from Virginia in a Hummer to unleash an attack at the Convention Center,” according to WPVI.
Philadelphia Police tells WPVI "they recovered a weapon and believed they recovered the Hummer they received a tip about.”
Votes are being counted inside of the convention center.
Police tell CNN affiliate KYW they were alerted to the threat around 10 p.m. local time on Thursday.
The threat involved a group of individuals from out of state, police tells KYW.
At least one person has been taken into custody, both WPVI and KYW reports.
Philadelphia district attorney's office spokesperson Jane Roh told CNN the office could not comment on the investigation.
CNN has reached out to the Philadelphia Police Department, FBI, the Bureau of Alcohol, Tobacco, Firearms and Explosives and the convention center for comment.
CNN's Alexandra Field has more: