Police arrested a district level leader of Sechasebok Dal, a voluntary wing of Bangladesh Nationalist Party (BNP) in different cases in Sirajganj on Friday night.The detainee is Saiful Islam, Joint Convener of Sirajganj district, son of Sarafat Ali.Confirming the matter, Dewan Koushik, Officer-in-charge of Ullapara Model Police Station, said, Saiful will be sent to the court.However, the local leaders of BNP expressed their deep concern over the arrest and urged the law enforces to release Saiful immediately.