"NATO sent a group of experts to Lithuania to assist in search operations," TASS quoted Stoltenberg as saying.
NATO Secretary General stressed that the alliance considers it necessary to treat detained migrants humanely.
Earlier it was reported that Lithuania will purchase another 300 km of barbed wire for installation on the border with Belarus.
The State Border Guard Service under the Ministry of Internal Affairs of Lithuania spoke about the expulsion of illegal migrants from Asian and African countries to Belarus.