The Mumbai Police probing the threat messages warning of a "26/11-like" attack on the city questioned the man detained from neighbouring Virar on the second consecutive day on Sunday, an official said.

The messages were received on WhatsApp on a helpline number of the traffic police's Worli control room around 11:45 on Friday night warning of a "26/11-like" attack on the city from a phone number with Pakistan's country code.