Second man arrested in Buckingham Palace knife attack.

BREAKING NEWS: Second man, 30, is arrested on terrorism charges after 'a knifeman shouting "allahu akbar" was caught brandishing a four ft sword outside Buckingham Palace'

• A 30-year-old man was detained in west London on suspicion of terror offences 
• It follows the arrest of a 26-year-old man from Luton at the scene on Friday
• A suspect drove at a police near the palace before brandishing the 4ft blade