On Thursday, police named the attacker as 52-year-old Khalid Massod. • Police named the attacker as 52-year-old Khalid Masood -- known by a number of aliases. • Speaking before Masood was named, Prime Minister Theresa May said the attacker was known to authorities for links to "violent extremism." • Britain's most senior counter-terror police officer said investigations were ongoing in London, Birmingham and elsewhere on Thursday. • The attacker is believed to have acted alone, according to Mark Rowley, the lead officer in the UK for counter-terrorism policing.

Source: CNN March 23, 2017 16:00 UTC