Earlier, Home minister P Chidambaram had warned that Pakistan-based terrorists could launch another sea-borne attack despite the bad weather and choppy seas.
Official sources said that the Jul 8 alert was issued based on the information received from the terror suspect who was detained in Jammu Kashmir. The police also recovered photographs of key areas likely the 'terror targets' in Maharashtra.
"The photographs are genuine. They include the picture of a reputed bank near the Bombay high court, two railway stations in Mumbai and a railway station in Navi Mumbai," an official said.
IB also mentioned four dates on which the terrorists planned to carry out the strikes. An officer said, "The LeT has been singled out as having planned an attack in the second alert too."