Christchurch terror attack: First police officer to arrive at Linwood Mosque told victims help was coming despite thinking it wasn't

An emotional police officer has told the coronial inquest into the Christchurch terror attack she was the first to arrive at the scene of Linwood Mosque on March 15.  

There, she told the victims help was coming - even though she didn't think it was.  

Police believed Christchurch was a city under siege.  

Amid the chaos, a constable alone in her patrol car heard a female voice over her police radio.   

"I could tell from her voice that something terrible was happening," she told the court, crying.  

The constable recalled arriving at Linwood Mosque just minutes after the terrorist had left, alone and with only a small pistol.  

"At this point, I believed there was at least one active shooter somewhere at the address killing people," she said. "I felt sick, at this point I believed there was a very good chance I was going to be shot or seriously injured."  

A group of stunned people walked towards her.  

"They were yelling they needed an ambulance," she said. "I was telling them help was coming but I didn't think anyone was."  

She told the court she knew "all available resources would be going to Deans Ave" - where the terrorist's first target of Al Noor Mosque was.  

A survivor showed her a video taken inside the mosque.  

"The video showed people on the floor in the mosque, some had been shot, I could hear people screaming," the officer said. 

Injured, dead and dying people were inside - including Musa Patel.  

"When the terrorist arrived at entrance door, he was running over towards his wife who's in that partitioned off area - and he gets shot," lawyer for Families Kathryn Dalziel said.  

Patel died 40 minutes later.  

Armed Offenders Squads arrived looking for the offender - instead they found many victims and a discarded gun.  

"I recall seeing the words, 'Welcome to hell,'" an AOS officer described to the court.   

There has been a lot of emotion from first responders in the inquest, who have faced challenging questions from lawyers about how things might have been better on the day.   

On Thursday, the coroner reminded people why the inquest is underway.   

"I said that doing this can be hard, confronting and distressing," deputy chief coroner Brigitte Windley said. "The possibility of learning lessons and turning truth to power."