 (Some reports cited the use of 2S4 Tyulpan instead, but their presence has not been confirmed, unlike that of the M240).The use of such heavy weapons in heavy-populated civilian areas was first confirmed from the tail fin of an exploded 240 mm shell in Homs in 2012, raising an outcry from human rights organizations such as Human Rights Watch.Later, videos documented both 240 mm mortars firing, and the shells landing on buildings in Syria.