The Nigerian army says it has recaptured a town held by Boko Haram since January 3, after a "fierce battle".
The army said in a tweet, mopping up operations were continuing in Baga, in the northeast of Nigeria.
Defence spokesperson Chris Olukolade claimed that "a large number of terrorists" drowned in Lake Chad as they tried to flee bombardment from air force jets.
Baga's captue by Boko Haram saw an ankown number killed by the militants, with locals saying over 2,000 people may have died.
Boko Haram lose control of key town (16 Feb 2015)
Niger to send troops to fight Boko Haram (10 Feb 2015)