Police are investigating after two explosive devices were detonated near an apartment building early Saturday morning. (Zulekha Nathoo/CBC)

Two explosive devices were detonated in a parking lot between two apartment buildings in northeast Calgary early Saturday morning in an attack police say was targeted.

Police say they were called to reports of what sounded like gunshots just after 7 a.m. in the 5300 block of Rundlehorn Drive N.E.

Officers arriving on scene found the first exploded device, and residents of about 25 apartment suites were told to leave their homes as a precaution.

Officers sweeping the area discovered a second device, which had also exploded.

Duty Insp. Frank Reuser said the two devices were placed next door to an apartment suite, and it appears the attack was targeted.

"It's very evident to me that the person who threw the devices away was probably within seconds of being injured or killed," he said.

Explosives not 'bombs,' police say

Ashley Hotchkiss, the manager of the apartment building, said she has never had any major issues with any of the building's tenants.

"I've never heard of anything about anyone being targeted in my complex," she said.

Hotchkiss said she doesn't know the tenants who were targeted.

Police wouldn't use the word "bombs" to describe the explosive devices, and said investigators are still working to determine what they were made of.

No suspects have been identified.

Anyone with information is asked to call the Calgary police at 403-266-1234 or Crime Stoppers at 1-800-222-8477.