This is the first terrorist attack on British soil since the murder of fusilier Lee Rigby in May, 2013.
A machete-wielding man who stabbed three men at London Underground train station on Saturday has been charged with attempted murder.
The Home Secretary said by protecting families the community would protect itself.
Friday's explosion on the London tube is the latest in a string of terror attacks in the United Kingdom in recent years. Here is a timeline of the terror that has unfolded in the UK.
The two "terrorist incidents" at London Bridge and Borough Market on Saturday night are among several attacks that have taken place in the United Kingdom in recent years.