As officers got out of their car to speak to Toms, he advanced on them, again armed with a machete.
Police shot at Toms and he was struck and killed.
Officers tried first aid and called an ambulance, but Toms died at the scene.
Detective Inspector John Sutton said yesterday that police had met Toms' family and updated them about the investigation, including the preliminary findings of the autopsy.
"While initial indications are that drugs may be a factor, it is unclear what led this man to behave in such a way," he said.
"Police hope to answer this for the family and all concerned."
It was earlier revealed that Toms was believed to have mental health issues.
Sutton said police were "committed to undertaking a thorough and transparent investigation" but there was "still much to learn about the incident and the contributing factors to it".
Toms' family have declined to comment on his death.
Where to get help
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.
OR IF YOU NEED TO TALK TO SOMEONE ELSE:
• Lifeline: 0800 543 354 (available 24/7)
• Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
• Youthline: 0800 376 633
• Need to talk? Free call or text 1737 (available 24/7)
• Depression helpline: 0800 111 757
