A Muslim worshiper described the horror that unfolded when a heavily armed gunman opened fire at a mosque in the New Zealand city of Christchurch on Friday.

A 28-year-old Australian-born citizen is in custody after claiming responsibility for the attacks on the Masjid Al Noor mosque and the Linwood Masjid Mosque, which left at least 49 people dead and more than 20 seriously injured.

The man, who allegedly posted a white nationalist manifesto immediately before the murder spree, was described by Australian Prime Minister Scott Morrison as “an extremist, right-wing, violent terrorist.” Three other people are also in custody.

Farid Ahmed was at the Masjid Al Noor mosque for Friday prayer when the gunman opened fire.

"I was hearing shooting after shooting after shooting," Ahmed said. "It went on about six minutes or more. And I could hear screaming and crying. And I saw some people drop dead."

Ahmed, who uses a wheelchair, described hiding beneath a bench inside the crowded mosque during the shooting.

“There was a bench, I just lie down [with] half my body under the bench and my legs out," he said. "Pretending to stop my breath. He changed magazines seven times. Bang, bang, bang, then when the bullets stop he [would] change the magazine again."

“The mosque is in a few compartments, he went to all different compartments and he shoot everyone.”

New Zealand Prime Minister Jacinda Ardern said none of the suspects were on any security watch lists.

"These are people who I would describe as having extremist views, that have absolutely no place in New Zealand," Ardern said.

Watch Fox News' Kitty Logan's report above.

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