10:06World UpdateLondon Attack: Met Defends Dropping Inquiry into AttackerBBC World Service Duration: 50 minutes Tue 6th Jun 2017, 10:06 on BBC World Service Americas and the CaribbeanPolice said Pakistan-born Butt, 27, was known to police and MI5 in 2015 Show more GenresNewsFormatsMagazines & ReviewsBrandWorld Update Source: BBC Online