The caveirao, literally meaning "big skull", is a military-style assault vehicle, with heavy armoury, a turret, and firing positions running along its body.
Used to police Rio de Janeiro's favelas, it is known to storm into communities, firing at random. It's loudspeakers blaring out:
"Children, get out of the street. There’s going to be a shootout."
Between May and September 2005, 11 people were killed in caveirao-led operations.
"Here they don't have the death sentence - they use the caveirao instead."
The caveirao is part of a pattern of confrontational and intimidating policing. It targets socially excluded communities, increasing violence and criminalizing poverty in Rio.