A third person has been arrested over the fatal stabbing of pregnant teenager Sana Ali in her own home in Bury in Greater Manchester.
Sana Ali was found in an upstairs bedroom by her sister-in-law
A 22-year-old woman from Birmingham, Mrs Ali's 24-year-old husband and a 16-year-old youth are all being held on suspicion of murder.
Mrs Ali, 17, and her unborn child both died in the attack on Friday.
She was discovered by her sister-in-law in an upstairs bedroom of the property in Throstle Grove, police said.
Paramedics took the teenager to Fairfield Hospital, but they were unable to save her or her unborn child.
A post-mortem examination revealed she died as a result of stab wounds to the chest and the abdomen.
Det Ch Insp Keith Dillon said Mrs Ali seemed to have been subjected to "a violent attack".
Mrs Ali, who was originally from Pakistan, moved to the UK five years ago and married her husband in December 2006.
She went to live with her husband and his family and was believed to be two months' pregnant when she died.