01/17/2017 13:28 EST | Updated 01/18/2018 00:12 EST

Two Calgary Police Service officers charged with serious crimes

CALGARY — Alberta's police watchdog says two officers from the Calgary Police Service have been charged with serious crimes, including the new head of the city's police union.

Calgary Police Association president Sgt. Les Kaminski has been charged with perjury and assault with a weapon and Const. Brant Derrick has been charged with assault causing bodily harm, the Alberta Serious Incident Response Team said Tuesday.

The charges stem from the arrest of Jason Arkinstall during a routine traffic stop in downtown Calgary in 2008 and from the evidence given during his trial on one count of uttering threats against Derrick.

Arkinstall was acquitted in 2011.

ASIRT's executive director Susan Hughson said the case was brought to her agency in January 2014.

Kaminski would have known he was under investigation in the lead-up to his election as police association president, she said.

"The fact that one of the officers has been elected to the Calgary Police Association is not relevant to my investigation or how we will deal with that officer."

Hughson said it's unfortunate it has taken this long for charges to be laid.

"The fact is, however, the majority of the delay occurred before ASIRT was directed to investigate," she said, adding the delay did not hamper the investigation, since evidence from the Arkinstall trial had been preserved.  

The Calgary Police Service was scheduled to hold a news conference later Tuesday. The Calgary Police Association said it would address the matter on Wednesday.

ASIRT investigates when people are killed or hurt by police or when police officers face serious or sensitive allegations of misconduct.

Both Kaminski and Derrick are to appear in Calgary provincial court on Feb. 7.