The Ottawa police guns and gangs unit is asking for the public's help to solve three shootings in Ottawa in 12 hours.

In the most recent case, a woman who was sleeping at her home on Ritchie Street woke up to a loud bang at about 4:30 a.m. Friday.

She thought something had fallen and didn't call 911, police said.

But later in the morning, as she was taking her children out to school, she found a bullet-sized hole in her window and called police.

When officers arrived they traced the possible trajectory of the bullet and found it lodged in an adjacent wall.

The guns and gangs unit has no witnesses and is urging anyone with information to come forward.

Man shot twice in arm 3 hours earlier

About three hours earlier, a man was seriously hurt after being shot in the arm twice during an incident in Lowertown, police say.

Police were called to the 200-block of Friel Street, near Rideau Street, at about 1:30 a.m. after reports of shots being fired.

The man who was shot was driving a car at the time and managed to drive to the corner of Rideau and Charlotte Street a few blocks away, where he caught up with police.

He was taken to hospital with serious but non-life-threatening injuries. An "associate" of the man, who was there at the time, wasn't hurt, police said in a news release.

No suspect was arrested in connection with the shooting later Friday morning, but the victim and his associate are facing several drug charges related to marijuana possession, police said. Their names are not being released.

Bayshore shooting in broad daylight

The first shooting happened Thursday in a parking lot at the Bayshore Shopping Centre in broad daylight.

Police were called to the parking lot at about 4:40 p.m. after 911 callers reported shots being fired.

Witnesses told police that a black car, possibly a Mercedes, was seen fleeing the area at high speed, and that the car then slowed down to let a man out.

That man then ran away, police said.

No evidence was recovered from the scene and police have few witnesses.

Officers are now searching for two possible suspects in connection with the case.

Anyone with information in all three incidents is asked to call the guns and gangs unit at 613-236-1222 ext. 5050, or call Crime Stoppers at 613-233-8477 (TIPS) — toll free at 1-800-222-8477.