An Islamist extremist allegedly shared a home-made video of London's Royal Festival Hall with the message "attack, attack", a jury has been told.
Shehroz Iqbal is on trial at the Old Bailey, accused of encouraging terrorism by posting the mobile phone footage to a group of like-minded friends on WhatsApp.
Opening the case, prosecutor Kate Wilkinson described 28-year-old Iqbal as someone with extremist views who is "volatile and prone to act in his extremism".
On March 11, he visited the Hayward Gallery on the South Bank, near the Royal Festival Hall and Waterloo Bridge, the court heard.
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