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Police cordoned off a section of Willis St this evening over reports of threats on a bus, before lifting the cordons just before 7pm.
Police said they were speaking to the person believed to have made the threat.
A Wellington commuter - who did not want to be named - said he was waiting at a bus stop on Willis St when he saw a driver pull over and kick a "big fella" off his bus.
"The bus driver was having a bit of a row with him but nothing major," the man said.
"Then the bus driver dragged off three big bags, overseas travel-sized bags."
The driver put the bags down and told the passenger to wait there until police arrived.
"It was all mellow, everyone was staying on the bus, they didn't seem that bothered," the witness said.
As the delay dragged on, the bus driver and the passenger got into a louder confrontation and began yelling at each other.
The other passengers then began to gradually get off the bus because they sensed it wasn't going to move anytime soon.
However, at no time, was there any panic or mention of a bomb, the commuter said.
It wasn't until police arrived 15 minutes later that the commuter heard the driver first mention the passenger had threatened him with a bomb in his bag.
"That's when everyone cleared out real quick and that's about 15 minutes after the bags had been put down on the sidewalk," the commuter said.
Police quickly responded with five cars arriving at the scene and said they were "not looking for anyone else in relation to the matter".
The incident occurred about 5.20pm and led to several buildings being evacuated along lower Willis St, according to New Zealand Herald reporter Jason Walls.
Officers had been going from business to business, instructing people to evacuate and get off Willis St.
Fellow reporter Devon Bolger said at the time she could see about 200 evacuated workers gathered on the street.