Cannabis plants were discovered when police raided a terrace house in Keighley on Wednesday morning.

A 32-year-old woman was arrested on suspicion of cultivating cannabis. She was led away from the house in Apsley Street, Keighley, her head covered with a sheet, after police struck at about 8.15am.

Twelve officers, some in protective clothing, raided the house as part of the force's Target initiative, a campaign to crack down on crime in the division.

Officers rammed the door open after initially knocking, and during a search of the house found nine cannabis plants in an upstairs room.

Scenes of crime officers were requested to photograph the premises and detectives planned to continue a search throughout the rest of the day.

Det Sgt Richard Thornton, of Keighley police, who was leading the operation, said: "It has been very successful. We forced entry with a warrant under the Misuse of Drugs Act and we found a quantity of cannabis plants which we believe were being cultivated.

"We are now in the process of securing the evidence and scenes of crime officers will be arriving to photograph the plants in situation before they are recovered. A woman has been arrested on suspicion of cultivating cannabis."

The team of officers assembled at 7.30am and was briefed by Det Insp Jeff Ashton, at Keighley Police Station. They were told that detectives suspected that the terrace house was being used to cultivate cannabis plants and that a warrant would be executed to search the premises.

"We are sending out the message to the community that there is no such place as a safe haven for people involved in criminal activity," he said.

The operation was part of a week-long series of high-profile policing, involving targeting areas of known crime in the division. Over 20 arrests have been made relating to alleged offences of robbery, burglary, theft and failing to appear at court.

Five warrants were issued under the drugs and theft acts. High visibility police patrols have been held in burglary hotspots.

Patrols have been supported by community beat officers, volunteers and street wardens.