An IT worker in Indonesia was arrested after he hacked into a local billboard and streamed a pornographic movie Friday before authorities managed to cut the electricity to the sign, police said.

Jakarta Police Chief Muhammad Iriawan said Wednesday that the suspect, 24-year-old Samudera Al Hakam Ralial, admits he hacked the IT system of the billboard operator but claims that the broadcast of the porn movie was accidental.

Twitter in social media-mad Indonesia was set alight by the incident, which occurred not long after Friday prayers last week in the Muslim-majority country.

Many users posted clips of the billboard as it displayed a Japanese porn movie to passing traffic. The BBC reported that access to pornographic websites are blocked in the Muslim-majority country.

According to Iriawan, Samudera said he didn’t realize a pornographic website he accessed after breaking into the computer system was uploaded to the billboard.

Authorities in the country said they are investigating the incident and trying to determine if he worked alone.