Roads leading to the campaign rally venue of former US President Donald Trump were seen under tight police surveillance following reports that the politician was injured while delivering speech in Butler on Saturday.

Footage shows the roads being blocked by police barriers, while the officers were seen holding light sticks to guide vehicles out of the closed routes. The rally venue was left empty, with some vehicles having American flags and flags showing support for Trump planted on the back.

Trump's campaign rally in Butler took a chaotic turn as several rows of gunfires were heard, leading to crowds screaming and calling for medical assistance, while the former president himself quickly ducked behind his lectern as was surrounded by armed security staff.

The politician was seen with blood on his face, with a bullet reportedly hitting his ear, raising his fist in air before being escorted out of the site. Trump is now 'safe' after being checked at a medical facility.

Two individuals, including the alleged shooter and an attendee, were reported dead, while two other spectators were in critical condition. According to local media, the gunman was killed by the US Secret Service agents at the venue, and his identity remained unknown at the time of publication.

Following the shooting, US President Joe Biden had contacted Trump and made his statements, calling the incident 'sick' and stressing that 'there is no place in America for this kind of violence.'

Other politicians in the US, including the former President Barack Obama and Secretary of State Antony Blinken also commented on the incident, condemning political violence and sending wishes to Trump.

The case is currently being investigated as a possible assassination attempt, according to law enforcement officials.