On Tuesday (29) at 4.38pm, one crew from Wisbech was called to a series of bin fires.
Crews were initially called to a bin fire on Church Mews, followed by three more on North Brink, Wisbech.
Firefighters used a hose reel to extinguish the fires.
The cause of the fires was deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.