June 5, 2018:

She was also pronounced guilty over an earlier attempt to travel to Syria for terrorism.

Safaa Boular an 18-year-old woman has become Britain's youngest convicted female Islamic State terrorist after a court found her guilty of plotting a terror attack on the iconic British Museum here with Britain's first all-woman cell.

Teen Safaa Boular was accused of planning to travel to Syria to join IS militants and later preparing to carry out a terrorist attack in London after her fiance, who was an Islamic State fighter, died.

A jury at the Old Bailey found her guilty of two offences of preparation of terrorism acts, the BBC news has reported.

Even her 22-year-old sister Rizlaine has already admitted planning a knife attack on London and their mother Mina Dich, 44, has pleaded guilty to assisting her.

Now convict Boular will be sentenced in around six weeks time, the report said.

During her trial, the court also heard how Boular - then 17 - plotted a gun and grenade attack at the British Museum.

The two sisters and their Mother Dich discussed their plans using Alice in Wonderland coded language, with Rizlaine as the Mad Hatter.

While aged 16, Boular was radicalised online in the wake of the 2015 Paris terror attacks.

She first met IS fighter Naweed Hussain on Instagram and after three months of chatting, she declared her love for him with an online marriage ceremony.

The trial court heard how she had wanted to join Naweed Hussain in Syria, but her travel plan was thwarted when British security services confiscated her passport.

Boular told the police about Hussain and security services deployed officers to pose as fellow extremists and speak to the pair online.

On April 4, 2017, Hussain was killed in a drone attack.

As per the prosecution claimed this only strengthened her determination to carry out an attack in the UK.

They were arrested on April 27, the date of the planned attack, along with friend, Khawla Barghouthi.

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