Yobs have been terrorising residents in Amble through a barrage of attacks, including pushing a burning object through a letterbox.
Sour milk and paint have also been thrown, while small fires have been started.
In the latest incident, police and a fire crew were called to an address in Philip Drive at just after 6.20am yesterday.
The emergency services were responding to two fires at the property – one caused by something being lit and pushed through a letterbox, while the second was at the side of the house.
The incidents caused minor damage and no one was hurt.
The police would not say what the burning item pushed through the letterbox was, but denied that it was a firework, following claims on social media.
However, they did say that they have made two arrests in relation to the incidents.
House-to-house inquiries have been taking place and reassurance patrols are being carried out.
Mayor of Amble Jane Dargue described the spate of incidents as absolutely shocking.
Neighbourhood Inspector Liz Hall, said yesterday: “The fire incident this morning follows similar reports of minor vandalism and damage, including paint and sour milk being thrown as well as small fires being lit.
“We have already made two arrests as part of our investigations and have been working closely with people living in the streets where these incidents have happened.
“There is no reason to believe that these incidents will affect the wider community and we are continuing our inquiries.
“I must praise the local residents we’ve spoken to. They have been extremely cooperative and we will continue to work them as we make house-to-house inquiries in the area and carry out reassurance patrols.”
A Northumberland Fire and Rescue Service spokeswoman added: “We were called at 6.21am yesterday to the report of a fire in the Philip Drive area of Amble. One appliance from Amble attended the incident and extinguished the fire.
“The fire service is working closely with Northumbria Police while further inquiries are being carried out.”
While new CCTV in Amble does not cover Philip Drive, Coun Dargue said that money is available for extra cameras and this area could be considered.