Image via WikipediaThey are five Algerians who worked as street cleaners. Sky News:

Armed counter-terror officers swooped on the central London agency to which they were registered in the early hours of the morning.
The suspects, who are aged 26, 27, 36, 40 and 50, are being held and questioned under the Terrorism Act 2000.
The firm where the arrests were made is now being searched, as well as homes in north and east London.
Sky News crime correspondent Martin Brunt said the men were street cleaners employed by the agency to work for Westminster City Council.
He said they were due to clean streets in Lambeth near where the Pope is due to travel, prompting the police to launch the operation to arrest them.
Brunt said: "I was at a briefing last week around the whole issue of the Pope's security and the point was made then that there was no known threat or intelligence to suggest a plot against the Pope.
"What the police are dealing with today is something that has cropped up in the last 24 hours."
A spokesman for Scotland Yard said: "Initial searches have not uncovered any hazardous items.
"Today's arrests were made after police received information. Following initial inquiries by detectives, a decision was made to arrest the five men.
"Following today's arrests the policing arrangements for the Papal visit were reviewed and we are satisfied that our current policing plan remains appropriate.