A 12-year-old suicide bomber has killed four people a crowded marketin eastern Afghanistan, in one of several attacks on the first day of a Taliban spring offensive.In a separate attack in in southern Ghazni Province, a gunman opened fire at a police checkpoint, killing two police officers and two civilians. And a bicycle bomb near Ghazni City’s police station wounded 13 civilians, BBC reports.

In Logar Province militants ambushed a convoy of NATO troops, starting a firefight in which three children were killed by Taliban fire, district governor Mohammad Rahim Amin told Agence France-Presse. The dead children were aged between eight and 14 years old, Amin said.