A British schoolgirl who fled to Syria has gloated over the fate of the tourists massacred on the beach in Tunisia.

Amira Abase, 16, one of three girls who vanished from their east London homes in February to join Islamic State, wrote that she was laughing out loud - 'Lol' in text language - as Britain mourned the 30 who lost their lives at Sousse.

In an exchange of messages on social media with an undercover reporter from the Mail on Sunday, Abase, when told of the minute's silence across Britain in memory of the victims, wrote "Loooool'.

When the reporter said some Muslim leaders were condemning the attack, she again replied 'Loool'.

And when the reporter suggested that the tourists were innocent, she replied "research", adding "like read about it".

Abase believed the reporter to be another British teenager planning to run away to join IS. She encouraged the "teenager" to make the trip to marry a jihadi fighter.

When the reporter asked if she thought it was a bit too young to marry at 16, Abase replied: "loool no. aisha (the Prophet's favourite wife) got married when she was 9."

Abase said that if the 'teenager' wanted to get married it was better to know the person's name beforehand so she could ask for him.

A woman could stay in IS territory without a male guardian "but u cant go out, no net, no phones, nothing, have to stay at home."

Asked if any women could go out without full burka, she said: "loool no u cant leave the house without wearing niqab".