Diving teams are searching a brook in Bolton as part of the murder probe following the disappearance of Maggie Smythe.
Margaret Jean Smythe, also known as Maggie, went missing from Breightmet on January 27.
Underwater search teams have been sent to Breightmet, to assist detectives in the search for Maggie.
Officers have been seen searching Blackshaw Brook, near to the Red Bridge Inn.
Two men, aged 35 and 39, were arrested on suspicion of murder on Wednesday by detectives searching for Maggie.
The 29-year-old was last seen between 3.30am and 4am on Saturday at her home address on Swinside Road, in Breightmet.
Investigators are still appealing for anyone who saw Maggie that day to get in touch with them.
- Anyone with information should call police on 0161 856 9908, or the independent charity Crimestoppers, anonymously, on 0800 555 111.