Lawyer Fahmi Moin, representing the couple, said the boy’s grandparents would be brought to court this morning and released on police bail.

“I was informed that they were detained in Subang Bestari after returning from court and taken to the Petaling Jaya police headquarters (yesterday).

“I went to the Petaling Jaya police headquarters after being notified of their detention and was told that they were detained to assist in the investigation under Section 302 of the Penal Code,” he told a press conference in front of the Petaling Jaya court complex.

Yesterday, Selangor police chief Hussein Omar Khan said the couple was arrested at 2.30pm to assist in investigations into the boy’s murder.

Zayn was reported missing in Damansara Damai on Dec 5 last year. He was found dead the next day about 200m from his apartment block.

The post-mortem revealed multiple injuries, including defensive wounds, while the cause of death was believed to be strangulation.