A woman brandishing a rifle reportedly walked into a skyscraper owned by Donald Trump, causing a major security alert Wednesday.

The incident occurred one day after the former US president was charged with 34 counts of falsifying business records to hide a purported affair with a former porn star.

He pleaded not guilty on all charges.

New York police were concerned that trouble might occur in New York during Trump’s arraignment, but none occurred.

However, according to local media, a police SWAT team had to be called to Trump Tower in Chicago on Wednesday morning.

Chicago newspaper the Sun-Times reported that a “rifle-wielding woman” walked into the Trump International Hotel and Tower located in the city’s central business district overlooking the Chicago River at 11:25 a.m. Wednesday.

Armed officers were called to the 98-story building on North Wabash Avenue.

However, the incident was not thought to be related to the Trump family.

The Sun-Times stated that police sent officers to the building’s 27th floor, where a woman went after saying she was “tired of being abused by her husband.”

A resident of Trump Tower told local radio station WBBM that he had come down to street level to get some air when he was confronted by armed police.

“I came down to the lobby and I was quickly escorted away from the lobby, out of the building and was told not to come back until it was clear,” said the man, Steve.

“I asked several times what was going on and they wouldn’t acknowledge.”

A Chicago police spokesman has said there was no threat to the public but did not give details of the incident.