A 19-year-old man has been jailed for life for planning a bomb attack that may have targeted an Elton John concert or Oxford Street in central London.
Haroon Syed, of west London, admitted preparing acts of terrorism after trying to source weapons including a suicide bomb and machine gun.
He was caught after approaching MI5 officers, who were posing as a fellow extremist, via social media.
Syed was sentenced to a minimum of 16 years and six months.
Last year, his brother was jailed for life for plotting to behead someone on Remembrance Sunday.
Judge Michael Topolski QC said Syed wanted to carry out "an act of mass murder" and therefore a discretionary life sentence was warranted.
Prosecutors say Syed's plans ranged from becoming a suicide bomber to staging a gun attack, and while he initially boasted of working with others, those people did not materialise.
Instead, over the summer of last year, he made increasingly urgent efforts to secure weaponry.
After he went online looking for help, a purported jihadist fighting overseas, known only as Abu Isa, introduced him to another extremist going by the name Abu Yusuf.
This second man was, in fact, a group of MI5 officers who were playing the role of a jihadist in what became weeks of social media chat with Syed.
Elton John bomb plotter Haroon Syed jailed for life - BBC News
Haroon Syed, of west London, admitted preparing acts of terrorism after trying to source weapons including a suicide bomb and machine gun.
He was caught after approaching MI5 officers, who were posing as a fellow extremist, via social media.
Syed was sentenced to a minimum of 16 years and six months.
Last year, his brother was jailed for life for plotting to behead someone on Remembrance Sunday.
Judge Michael Topolski QC said Syed wanted to carry out "an act of mass murder" and therefore a discretionary life sentence was warranted.
Prosecutors say Syed's plans ranged from becoming a suicide bomber to staging a gun attack, and while he initially boasted of working with others, those people did not materialise.
Instead, over the summer of last year, he made increasingly urgent efforts to secure weaponry.
After he went online looking for help, a purported jihadist fighting overseas, known only as Abu Isa, introduced him to another extremist going by the name Abu Yusuf.
This second man was, in fact, a group of MI5 officers who were playing the role of a jihadist in what became weeks of social media chat with Syed.
Elton John bomb plotter Haroon Syed jailed for life - BBC News