Two of the police officers who helped deliver a baby boy at home on Sept. 8. (Halifax Regional Police)

A mysterious 911 call turned into a once-in-a-lifetime event for four Halifax Regional Police officers earlier this week.

It started with an emergency call on Tuesday at around 5:40 a.m. The only thing that could be heard over the phone line was someone groaning, so four officers were sent to a Halifax home.

The officers discovered a woman lying on the floor of the home — in labour. She was eight and a half months pregnant, and her baby had clearly decided he wasn't waiting any longer to make his grand entrance.

The police officers called for paramedics, and brought pillows and blankets for the woman.

A female officer kept watch as the woman's labour progressed. She also helped the paramedics deliver the baby once they arrived and took care of the baby boy after he was born.

"It was an amazing experience as it's not the norm in policing to welcome a life into the world," she said.

Her colleague helped support the woman during the delivery and coached her through her breathing. He said it was a once-in-a career opportunity to which nothing else will compare.

Halifax police say mom and baby are doing well, and the officers didn't want to be identified by name.