LUCKNOW, March 14 -- Police on Saturday arrested a man and his second wife after the post-mortem examination of his four-year-old son from his first marriage revealed multiple injuries on the child's body, raising suspicion of sustained physical abuse before his death in Lucknow's Chowk area late on Thursday night.

The accused have been identified as Bhishm Kharbanda and his wife Ragini, residents of Lajpat Nagar under the Chowk police station limits. The post-mortem examination conducted on Friday found as many as 18 serious injury marks on his body and multiple fractures, prompting investigators to suspect that the boy had been brutally beaten and possibly suffocated, said a police officer.

"Based on a complaint filed by the child's m...