As many as 40 school children were on board the boat.
The toll is likely to release, reports said.
The Coast Guard said it has has diverted ships which were at sea and ships are also sailing from Mumbai. Meanwhile, according to a leading daily, speaking on the incident, Superintendent of Police said, "There was an incident of boat capsize at Dahanu Parnaka Beach".
DySP and Local Magistrate had rushed to the scene and overseeing the rescue operations.
In addition, the Coast guard vessels and Dornier aircraft has been deployed for the rescue operations. Search operation is going on. 25 students were rescued with the help of locals and search for the remaining 11 students is on.