The air ambulance landed close to Hereford Racecourse earlier.
Emergency services have been called to an address in Kempton Avenue, Bobblestock, Hereford.
Rescue teams have so far confirmed that one woman victim has sustained serious stab wounds.
Six police cars and three ambulances are at the scene while the air ambulance has landed nearby.
The road has been sealed off and police have been seen with shields.
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