Protesters have been seen clashing with Baltimore police in the latest display of unrest following the death of a black man who was injured while in police custody.

Local television footage showed protesters confronting officers wearing full riot gear on Monday.

Baltimore police posted on Twitter that a group of juveniles began throwing "bricks and other items" at police and that "officers have been injured".

Earlier on Monday, the department said it had received a "credible threat" that various gangs had agreed to work together to "take out" police officers.

The clashes began just hours after mourners gathered for the funeral of Freddie Gray, who died in hospital a week after suffering a spinal injury while in police custody.

His death on 19 April has been followed by a week of mostly peaceful protests across the city.

Events turned ugly on Saturday night, however, when demonstrators began smashing shop windows, looting merchandise and vandalising police cars.

On Monday, several people were seen smashing up a police vehicle. An armoured vehicle arrived carrying officers arrived a short time later sending the rioters scattering.