A Phoenix firefighter was arrested on accusations that he caused more than $25,000 in damage to a townhome after the resident threatened to tell his wife he was having an affair.

Gregory Knauss planned to sabotage the plumbing and HVAC system of the townhome in a retaliation plot, Peoria police said, according to FOX 10 Phoenix.

Detectives said a witness noticed Knauss on the roof of a townhome in Peoria, Arizona, on Jan. 23.

Detectives said Knauss was involved in a dispute with the townhome’s resident over a romantic relationship Knauss allegedly had with the resident’s girlfriend. (Peoria Police)

On Feb. 27, Knauss was arrested and charged with multiple crimes, including second-degree burglary, criminal damage, harassment and threatening and intimidating.

FOX 10 reported Knauss is a fire engineer with the Phoenix Fire Department.