BANGALORE, July 17: A rowdy involved in extortion and attempt to murder cases was arreted by Siddapura police. According to police, Kalapili alias Lakshminarayana had recently threatened a petrol station employee at Tayanagar and had taken away Rs 500, besides 10 litres of petrol from the petrol station. He was also involved in several other extortion and attempt to murder cases elsewhere in the city.