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Police SWAT teams have swooped on the area in Kentucky at Hillvue Heights Church in the US.

The rampaging knifeman is believed to have badly injured at least one person in the horror attack at around 09.30am local time.

Armed officers have sealed off the area as a helicopter flies over the area.

The attacker has been arrested.

Witnesses told WBKO local news that they saw lots of blood as the church service descended into chaos.

There are also reports that one of the pastors tackled the armed attacker.

Police have not confirmed a motive.