Policeman and alleged attacker among four dead in UK parliament terror assault

What we know

• Five people are dead, including a police officer and the alleged attacker
• Several others have "catastrophic" injuries after a car reportedly mounted the pavement on Westminster Bridge and "tried to mow people down" 
• A woman was treated after "falling" from bridge into the River Thames 
• A police officer is dead after being stabbed inside Parliament grounds 
• The alleged assailant is dead after being shot by armed police
• At least 40 people have been injured
• Police are treating the incident as terrorism
• Police believe there was only one attacker 
• PM Theresa May is chairing a COBRA emergency meeting...read more>>>...