The London-based Syrian Observatory for Human Rights said that Syrian soldiers were killed in a military post in Tel Abyad in Turkey's retaliatory military action, but didn't give information on the number of deaths.
A mortar bomb fired from Syria landed in a residential district of the southeastern Turkish town of Akçakale on Wednesday, killing a woman and four children from the same family and wounding at least 13 other people.
A cloud of dust and smoke rose up over low-rise buildings as Akçakale residents ran to help the wounded. Others, infuriated by the increasing spillover of violence from Syria's civil war, took to the streets shouting protests against the local authorities.
The shelling appeared to come from forces loyal to Syrian President Bashar al-Assad's regime, which is fighting rebels backed by Turkey in an escalating civil war.