Cape Town - A News24 journalist was left shaken on Tuesday morning after a policeman pointed a firearm at her and threatened to shoot her in peak morning traffic.

The policeman was part of a security operation believed to be transporting cash to the South African Reserve Bank office in central Cape Town.

Jerusha Sukhdeo-Raath, head of video at 24.com, was travelling to work with her husband, Gideon, at 07:45 when they noticed a number of heavily armed police vehicles and officers.

"I didn't realise what was happening, and as a reporter, I pulled out my phone and tried to get snippets of what was happening around me," she said.

"At the intersection of Strand Street and Adderley Street, I propped up my phone on the dashboard and filmed what was happening. The second I started filming this man came and pointed his gun at me and said 'I will shoot you, what are you doing?'

"He walked to the passenger door and gestured as though he would open the door. I yelled 'You can't do that'.