An American school teacher in Abu Dhabi was stabbed to death by an unknown person wearing a traditional black robe with a veil, reports said, citing officials, on Tuesday. The attack on the 37-year-old woman occurred in a public restroom at a mall and officials have confiscated the sharp tool with which she was attacked.

Abu Dhabi’s interior ministry said, in a statement, that the incident occurred on Monday. The woman, whose identity has not been disclosed, had 11-year-old twins, who will be handed over to her former husband when he reaches the country. The children are currently in police custody. The attacker, who is still on the run, had a fight with the victim before stabbing her in the restroom of the upscale Reem Island in Abu Dhabi, The Associated Press (AP) reported.

"The Abu Dhabi Police will spare no effort in order to unveil this heinous crime and bring the culprit to justice," Col. Rashid Borshid, head of the Criminal Investigation Department, said in a statement, according to AP.

The U.S. embassy in the United Arab Emirates (UAE) said that it is aware of the incident and that it is in touch with authorities in Dubai to investigate the case, AP reported.

The UAE, which is an ally of the U.S., is considered a safe place for Westerners in the Middle East, and there are more foreign nationals living in the country than locals.