The Turku Cathedral Parish has apologised for a technical glitch that caused the landmark cathedral's bells to ring all night on Monday.
The cathedral's bells began ringing on Monday afternoon and continued into Tuesday. At one point on Tuesday, the bells rang non-stop for an hour.
In a tweet issued on Monday, the parish explained there was a fault in the clock's mechanism that was being investigated.
Despite attempts to shut down the system, the bells continued to ring throughout the night until the system was physically disconnected from power. The bells stopped ringing on Tuesday morning.
A maintenance service was called in and repairs were to be made on Tuesday, according to the parish.
Normally the cathedral's eight bells ring every 15 minutes in different variations, depending on the time.
Originally made of wood, construction of the church was completed in the year 1300 as a Catholic cathedral and the structure was gradually expanded over the 14th and 15th centuries, increasingly with stone and brick.
The building suffered heavy damage during 1827's Great Fire of Turku, which devastated most of the city, but was reconstructed.
The cathedral is the central church of Turku's Lutheran Archdiocese and considered to be Finland's most important religious structure.