A day after 21 houses were set on fire in Bihar’s Nawada district, a top state government official on Thursday said 15 people have been arrested in this connection. Preliminary investigations indicate that a land dispute may have triggered the incident, which took place in Manjhi Tola within Mufassil police station area on Wednesday evening, police said. Nawada District Magistrate Ashutosh Kumar Verma told PTI, “The district police has arrested 15 people for allegedly torching the houses. An SIT has been formed to investigate further, and searches are ongoing to apprehend the remaining suspects.”