People arriving at the train station were told this morning that they could not use platforms three and four because of the shooting.
A neighbour whose home fronts on to the crime scene said she heard a lot of yelling early this morning.
A wire fence is all that separates her property from a large trail of blood, a pair of black sunglasses, a cap, a lighter and a cardboard box - all strewn across the concrete pavement.
Another man said his daughter heard two loud bangs from their home about 2km away.
A man whose home neighbours Central Park said he heard a lot of commotion last night about 1am, including aggressive shouting and arguing, and a loud noise that could have been gunfire.
The man, who wished to remain anonymous, said there were often people in the park between Wednesday and Saturday night who had been at nearby bars.
Young people often drank in the park, and property was vandalised frequently, he said.
A witness told Newstalk ZB he was on the western side of the railway station, right beside the Papakura police station about 3am, where there were armed police and cordons in place.
He said Central Park was cordoned off, and he thought Opaki Rd was also cordoned off.
"There's quite a lot of police out there, they've got their lights flashing and their rifles out."
A police spokesman said there was no danger to the public.