The bomb squad and the police Specialist Search Group today searched an empty section behind a commercial building in Albert St in Hastings, where the hand grenade and IED were found and closed the street off, after a "suspicious item" was found, that later turned out to be of no further interest police said.
The search of the section is likely to finish this afternoon.
Police say the man who found the hand grenade yesterday was clearing vegetation from a neighbouring property when he found the package wrapped in plastic material near the fence line of the two sections.
Mr Greville said results from the forensic tests would hopefully provide police with more information about the devices.