Firefighters were called to two arson attacks in St Helens - in the space of just seven hours.
A pile of rubbish was set alight next to the East Lancs Road near Moss Bank Road - at about 11pm on Friday, July 18.
Fire crews also attended a fire involving an arson attack at a large industrial bin in Duke Street at around 5.30am the following morning.
Station manager Franny Hill said: “If a fire appliance is attending a deliberate fire it may delay the response to other emergencies. Grass fires and rubbish fires can spread quickly and get out of control.
“Where possible residents are advised to lock their wheelie bins away and store them away from their property. We investigate all fires we are called to and pass information on to the police. Deliberately setting fires on grass land and open spaces is arson.”