Police in the United Arab Emirates have arrested a local woman on suspicion of stabbing to death an American school teacher in a restroom at a shopping mall in the capital, Abu Dhabi.
Authorities say the suspect also tried to plant a makeshift bomb at the home of an American doctor. The bomb was dismantled and no one was hurt.
Police say the victim in Monday's stabbing was killed by a woman wearing clothing commonly worn by Arab Muslim women in the Gulf region.
Security cameras at the mall had filmed the suspect wearing a black robe, black gloves and a niqab - a Muslim veil that conceals the face except for the eyes.
The victim taught at a school in Abu Dhabi, and was the mother of 11-year-old twins.
On Wednesday, a police spokesman said a fight had broken out between the victim and the attacker in a women's restroom at the shopping mall, before the victim was stabbed there by a sharp object.
The stabbing came after the U.S. embassy in Abu Dhabi warned Americans in October of an online Jihadist posting that encouraged attacks against American teachers at schools in the Middle East. There was no immediate indication the mall attack was related to the threat.
The United Arab Emirates hosts thousands of foreign workers and has built an image of a relatively open society among Gulf Arab nations. It is part of the U.S.-led coalition conducting airstrikes against Islamic State fighters in Iraq and Syria.