A 14-year-old witness to the mosque shooting has described the "running and screaming" that followed.

Idris Khairuddin says prayers were just about to begin when he heard multiple gunshots.

"At first I thought it was just like construction work or something, then people were all running and screaming," said the 14-year-old Hillmorton High School student.

His uncle Tamizi was one of about six persons he knew got shot.

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Idris said he was sitting near the door, he said he saw people falling down but wasn't sure if they were injured.

"I just ran as fast as I could, over the fence to Hagley Park, I didn't stop," he said.

"The gun shots sounded like pop, pop, pop...I heard over 50."

Idris and his uncle were both Malaysians living in Christchurch.

"My uncle got shot in his backside, I am just praying it is not too serious."

"This week is the first time I went to the mosque...I am still shaking, and I am traumatised," Idris said.

He said everything was a chaos as people scrambled to get out of the mosque.