Police picture of siege now complete

Numerous weapons were found in the Chaucer Rd home of gunman Jan Molenaar. Photo / Supplied

Police recovered 127 spent cartridges scattered around the house and yard. They had been fired from every room.

A fear of prison and losing his house, with paranoid delusions that police were spying on him, drove Jan Molenaar to open fire on officers, the police investigation has found.

Police yesterday finished the scene examination of the bullet-ridden Chaucer Rd house where the 51-year-old killed himself after a 48-hour armed siege that left one policeman dead and two others and a civilian critically injured.

Detective Superintendent Rod Drew said no one else would be charged in relation to the attack and the picture of what had happened was now complete.

"The picture is one of a preconceived attack by the gunman alone."

Molenaar had been growing and dealing cannabis for more than 10 years, Mr Drew said.

"When the cannabis cultivation and dealing were discovered by the police officers that morning, he feared confiscation of his house and imprisonment.

"He therefore determined to 'go out fighting' rather than permit that possibility."

It appeared this and his erroneous belief that police had been spying on him had created a situation in his mind that did not exist and led to the sudden and unprovoked attack, Mr Drew said.

There was no evidence anyone else was involved, but people had known Molenaar had illegal firearms and he had discussed with friends what he would do if police caught him.

"Tragically, they did not pass that information on. If they had, perhaps this tragedy might have been avoided."

None of these people was criminally liable, Mr Drew said.

Police found 127 spent cartridges scattered around the Chaucer Rd house and yard.

They had been fired from every room, but mostly from the entrance-way, lounge and the master bedroom where Molenaar had barricaded himself. He had knocked holes through the walls of the master bedroom so he could fire into other rooms from his stronghold, Mr Drew said.

Police also found about 2000 live rounds, 10 fully loaded spare magazines and improvised explosive devices.

Three of the weapons had been stolen in burglaries in Feilding, Napier and Taihape between 2003 and 2008 and police would continue to investigate the origins of the others, Mr Drew said.

Molenaar's partner, Delwyn Keefe, 43, returned to the Chaucer Rd home on Wednesday.

She was upset when she arrived there about 2pm, and told media to get off the property, Hawke's Bay Today reported. Friends and family supported her as she entered the house and they brought food, cleaning products and blankets.

A relative of Molenaar told the newspaper that tradespeople had offered to help restore the house and a friend of the couple had offered to paint the interior.

The family planned to conduct a cleansing ceremony. "It's about getting back to reality, back to life and trying to deal with the pain," the relative said.

The siege started on May 7 after police went to Molenaar's house to serve a cannabis search warrant.

Molenaar shot and killed Senior Constable Len Snee and injured Senior Constables Grant Diver and Bruce Miller.

He also shot Leonard Holmwood, a friend and neighbour.

- NZPA