Police forces grapple with fallout of armed officer's murder charge as Home Secretary orders review of legal protections

Over 100 Metropolitan Police firearms officers handed in permits due to concerns over potential prosecution.
Walkout has significantly reduced London's armed police capacity, requiring military assistance.
Officers cite lack of legal protections and confidence as well as pressure from families.
Home Secretary has ordered urgent review into laws governing police use of force.
Police leaders argue for stronger legal safeguards to enable officers to protect the public amid increased scrutiny.