Three more men have been arrested as police continue to investigate the Manchester Arena attack. The police had earlier arrested a 23-year-old British born, Salman Abedi. One of the three people arrested is Abedi’s brother. About 22 concertgoers were killed and 64 were injured in the attack, which took place while Ariana Grande was performing. Terror alert has been raised in the UK to a “critical” level while Prime Minister Theresa May warns of imminent attacks. Troops have been deployed to strategic places include Downing Street, embassies and palace of Westminister. They are to help the police, and also whose control they are put.