Armed police arrested a man after storming a flat in East End Park.
Armed officers, the force helicopter and a police dog unit were all at the scene in Ivy View, just above York Road.
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A witness, who works in nearby Ivy Mount Fisheries, said: "At about 3pm I saw three normal cop cars and two more unmarked cars. They were all armed and there was a dog car.
"They sped up the road and blocked off the streets and then raided a house.
"I heard them saying 'We are sending the dogs in, don't move'."
The police helicopter supported the operation.
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A police cordon remains in place around a flat above a shop in Ivy View, and around a short stretch of pavement leading to Ivy Mount.
West Yorkshire Police confirmed that a man had been arrested but said they were not in a position to give more detail at this time.