Police have called the latest incident in Hamilton involving a suspicious package a hoax but have not ruled out a link to two others found in the city just days earlier.

A Defence Force bomb squad robot was deployed on Monday to deal with the third suspicious package in the city in just seven days but it went unused after experts found there was no risk to the public.

Police were called to Melville Park near Waikato Hospital where the package was found in the womens' public toilets.

Senior Sergeant Andrew Townsend of the Waikato District Command Centre said they were not ruling out links between the cases.

"Police are keeping an open mind in regards to if today's incident is related to earlier ones in the city last week and we are appealing to the public with any information they may have," said Townsend.

The incident follows at least two fake bombs found at Gower park last week and earlier but unrelated incidents in the city.

Police were called to Gower Park near Hamilton Lake last Monday morning after a council worker located a suspicious metal item with wires attached.

The Auckland-based bomb squad team destroyed the item manually but were called back again on Tuesday when a second item was discovered at the same location, in the Gower Park womens' toilets.

It was accompanied by a note, understood to be a taunt to police over the previous day's event.

Gower Park and the Sandleigh Rd cul de sac were again cordoned off while the second hoax bomb, made of pipe and electrical wires, was destroyed.

Police were alerted to the Melville Park discovery, just one kilometre from Gower Park, about 9am on Monday and a cordon was imposed.

"A Hamilton City Council groundsman found the suspicious package in the female toilets of Melville Park, off Normandy Ave, and raised the alarm," said Townsend.

Melville Park is the home of the Hamilton Dog Obedience Club and the Hamilton Roller Skating Club. A number of cars were parked in the carpark and walkers were prevented from entering.

"As a result police responded by cordoning off the area to await the arrival of a defence force Explosive Ordnance Disposal (EOD) team from Auckland."

The package was inert and posed no risk to the public, said Townsend. The groundsman who found the package did the right thing.

"Our advice... is not to approach or move it but to remove themselves to a safe distance and ring 111," he said.

Anyone with information are asked to call Hamilton police on 07 858 6200 or can provide the information anonymously through the independent Crimestoppers on 0800 555 111.