Detectives have arrested two people in London on suspicion of hacking Washington's CCTV system ahead of President Donald Trump's inauguration.

The home of a British man, aged 50, and a Swedish woman, also 50, was raided in Streatham, south London on January 19.

It comes as storage devices which record data from police surveillance cameras in the American capital were allegedly compromised between January 12 and 15.

Hackers disabled 123 of 187 security cameras in Washington, starting a major security incident.

It is believed the first cyber attack could have been a dry run with another potentially planned during the presidential handover.