Four people have been found guilty for their involvement in a methamphetamine drug ring linked to the explosion of a former KingKat building in Katikati in 2012.

The two week trial came to a close yesterday when Karl Rodney Goldsbury, 39 from Maketu, was found guilty of one count of attempting to pervert the course of justice, possession of iodine, conspiring to manufacture methamphetamine, supplying methamphetamine and supplying hypophosphorous acid used in the manufacture of methamphetamine.

Black smoke seen coming from the fire on December 9, 2012.

Firefighters spent five hours trying to get the P-lab fire in Katikati under control.

In the High Court in Rotorua, the jury of 12 acquitted him of one count each of manufacturing methamphetamine, arson and conspiring to supply methamphetamine.

Tracey Angela Farrow, 28 from Katikati, was found guilty of conspiring to supply methamphetamine and supplying methamphetamine.

Ryan David Carroll, 34 from Judea, and Terrance William Jones, 30 from Katikati, were found guilty of conspiring to manufacture methamphetamine.

Jones was also found guilty of attempting to pervert the course of justice – an offence he was jointly charged with Goldsbury for.

At the start of the trial, Jones pleaded guilty to one count of offering to supply.

Mark Kimber, 49 from Hairini, and Simon Whare, 40 from Te Puke, were both acquitted of supplying methamphetamine and manufacturing P.

The charges stem from incidents in 2012, when a P-lab at a Katikati property was set alight during an armed police raid on December 9.

The former KingKat factory burst into flames with neighbours reporting hearing loud bands before seeing balls of smoke coming from the property at the time of the incident.

Police say the fire was deliberately lit by three occupants of the Park Road property.

More than 20 firefighters spent about five hours trying to get the blaze under control.

Three days after the fire, police executed search warrants in Maketu, Te Puke and Tauranga in relation to Operation Detroit.

Read more about the operation here.

Following the guilty verdicts in Rotorua yesterday, Goldsbury was remanded in custody, while Carroll, Jones and Farrow were released on bail for sentencing on October 15 in Rotorua.