Atiq Ahmed's brother-in-law Zaki Ahmed was arrested by CBI (File Photo)

Central Bureau of Investigation (CBI) has arrested an accused in connection with the ongoing investigation of a case related to the alleged kidnapping and assault of a businessman from Lucknow, the investigative agency said in a statement on Thursday.

The accused has been identified as Zaki Ahmed, the brother-in-law of former Samajwadi Party lawmaker Atiq Ahmed.