Ahmed al-Dhanhani, attorney general for the state security prosecution, told state news agency WAM that al-Hashemi was executed Monday morning following the approval of the president, Sheikh Khalifa bin Zayed Al Nahyan.

Alaa Bader Abdullah al-Hashemi stabbed Ibolya Ryan, 47, to death inside toilets in the shopping center in December 2014. It failed to explode.

In the verdicts issued in June, the Federal Supreme Court in Abu Dhabi said Hashemi had used an Internet account to spread information that was likely to “jeopardise” the United Arab Emirates. Attacks on Westerners are rare in the UAE, a wealthy oil exporter and tourism hub, but concern has been rising after a spate of Islamist attacks in other Gulf countries including Saudi Arabia and Kuwait. The last known execution was in January 2014, when a Sri Lankan migrant worker convicted of murder was shot dead by a firing squad.

She was dressed in black from head-to-toe.

Hashemi was arrested by Abu Dhabi CID during a raid at her home three days after the incident.

Hashemi’s lawyers argued she suffered from chronic mental illness, which caused her to have “unreal visions” and see “ghost-like people”, and that she needed psychological help, according to the local newspaper, The National. The best way to show the utter failure of her goal and to repudiate her use of violence is for all of us to continue exhibiting the values of tolerance and coexistence of which this country deserves to be proud.

But Emirati authorities say she embraced “jihadist ideology and then engaged in terrorist acts in support of terrorist organisations” such as al Qaeda and Islamic State.

It is unclear how Hashemi’s execution was carried out.