Police say a man injured in Wednesday's Westminster terrorist attack has died, and the latest victim is reported to be a 75-year-old man.

London’s Metropolitan Police confirmed that the 75-year-old died "after his life support was withdrawn" Thursday evening.

Detectives investigating the terrorist attack in #Westminster can confirm that a 75yo man died tonight after his life support was withdrawn. — Metropolitan Police (@metpoliceuk) March 23, 2017

Three others died in the attack by Khalid Masood, who was shot by police during the incident. Masood's three other victims were police officer Keith Palmer (48), teacher Aysha Frade (43) and US citizen Kurt Cochran (54).

READ MORE: London parliament attacker named as 52-year-old Khalid Masood

Earlier on Thursday, police released a statement detailing arrests made in connection with the attack. A total of eight people have been arrested so far, including seven people in three different locations in Birmingham, while a 39-year-old woman was arrested at an address in east London.

The suspects were arrested on suspicion of preparing terrorist attacks. The Metropolitan Police said that the investigation into the deadly attack “continues to develop at a fast pace and involves hundreds of detectives.”