Three people have now been arrested following a spate of arson attacks in Whitby over Goth weekend.
There were five incidents within the space of four hours in the early hours of Sunday April 26.
Four people were taken to hospital after the incidents.
The first fire was at 2.45am when a car was set on fire at Spring Hill Court.
At 4.10am fire crews were called to a large bin fire next to a residential property in Station Square.
Around 20 minutes later a holiday home was set on fire on Pier Lane where police believe a fire was started in the letter box.
Two holidaymakers staying at the cottage suffered smoke inhalation and were later discharged from Scarborough Hospital.
An hour later a couple staying at a property on Cliff Street reported a burning rag had been pushed through the door.
As police and fire crews were dealing with that they spotted smoke at another property just yards away.
A bin had been pushed against a door and set on fire.
The elderly occupants were led out of the house but also taken to hospital with smoke inhalation.
Within days of the incident a 39 year-old man from Barnsley in South Yorkshire had been arrested in connection with the fires along with a 23 year-old local woman.
Since then a third person has been arrested and released on police bail.
The investigation remains on-going but Sgt Rachel Wood said local police teams were working with the fire service to reassure local residents and visitors too.
She said: “We have got three persons arrested for that and we have had no further arsons so we are satisfied we are on the right track with that.
“We have got a lot of work in place with the victims and are doing work with the fire service to address that and to reassure people.”