HOUSTON (AP) - The Latest on prosecutors complaints over sluggish cooperation by police in the investigation of a deadly January drug raid (all times local):

6:30 p.m.

Houston's police chief insists his department has cooperated with the Harris County District Attorney's Office in the investigation of a deadly January drug raid.

Chief Art Acevedo says the department will continue to cooperate with the D.A. in the investigation of the raid that killed a couple and injured five officers.

Prosecutors had accused police of dragging their feet in providing records on the department's use of confidential informants.

Acevedo says his department has "responded to all of the requests specifically related" to the investigation.

4:40 p.m.

Prosecutors are accusing Houston police of dragging their feet in the ongoing investigation into a deadly January drug raid that killed a couple and injured five officers.

The Harris County District Attorney's Office in a letter Thursday threatened to issue subpoenas to Houston police in order to get department records that prosecutors say they first requested six weeks ago.

Prosecutors are requesting records related to confidential informants.

The records are being sought as part of the investigation into the Jan. 28 raid in which 59-year-old Dennis Tuttle and his 58-year-old wife Rhogena Nicholas were fatally shot.

The raid came under scrutiny after allegations that an officer lied about using a confidential informant in order to obtain the search warrant.

Houston police didn't immediately comment on the letter.

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