A teenager arrested in connection with a string of arson attacks across the city will face no consequences after police announced the case is closed.

He was questioned in connection to three fires that were started in different locations within a five month period last year. 

The first happened in Trowse, at the Deal Ground site in Bracondale and the second was at  the disused St Andrew Hospital in Thorpe St Andrew. 

The final blaze was started at the Trowse Pumping Station on November 12. 

The teenager was initially arrested on November 16 and taken to Aylsham Police Station for questioning.

The fire at St Andrew's Hospital, Thorpe St Andrew, on October 19The fire at St Andrew's Hospital, Thorpe St Andrew, on October 19 (Image: Norfolk Constabulary)

Police released the unnamed teen on bail before extending it on four separate occasions.

His bail conditions included a clause to not enter any derelict buildings and he was also given a curfew to stay home between 9pm and 6am.

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He was then released under investigation as police continued to look into the case.

The aftermath of the fire at Deal Ground site in BracondaleThe aftermath of the fire at Deal Ground site in Bracondale (Image: Submitted)

Now, nine months after his arrest, police say the teenager will face no further action after closing the case.

A police spokeswoman said: "The case has been closed pending any new information.

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"The teenager arrested faces no further action."

The first at Trowse Pumping Station on November 12The first at Trowse Pumping Station on November 12 (Image: Christopher Tubby)

The Deal Ground site had been broken into on several occasions since becoming derelict and there were concerns about security prior to the attack.

The former Thorpe St Andrew hospital site had been out of operation since 1998 and planning permission for a business park there, in 2016, never came to fruition.

Civic Watchdog, the Norwich Society, had also previously warned the grade II listed Trowse Pumping Station was in danger of neglect before it was set ablaze.

Police said the teenager arrested would face no further action after closing the casePolice said the teenager arrested would face no further action after closing the case (Image: PA Media)