British "jihadi bride" Sally Jones, also known as “Mrs Terror,” has taken to Twitter to threaten UK civilians with a summer of bomb attacks.
The so-called "white widow" warned people not to go into Central London through June or July, especially by tube.
She also made threats against the Scottish city of Glasgow and towns in Wales.
Jones posted a new photograph of herself by the sea dressed in a black burqa. She changed her Twitter biography location to Mosul in Iraq.
It appears she has moved from Islamic State-held Raqqa in Syria, which is coming under growing pressure from Kurdish and government forces.
Jones, a former punk rocker from Kent, who converted to Islam, was married to extremist Junaid Hussain, a computer hacker from Birmingham. He was killed in a US drone strike in Raqqa last year.
The 47-year-old also took to social media to mock the drone pilots for killing her husband.
Jones, who now uses the name Umm Hussain, also urged British women to carry out attacks on civilians in the UK during Ramadan.
Ritz Kata, director of the SITE Intelligence group, appeared to confirm the Tweets had been issued by Jones.
She explained the account avoids suspension by Jones repeatedly taking the account down, and deleting and retweeting her posts.