Four children were seriously injured after a mysterious explosion took place in front of the DSP office in Ubauro in Ghotki district on Sunday, reported 24NewsHD TV channel. 

The nature of the explosion could not be ascertained yet.

Scenes of chaos were observed as citizens were enraged over the absence of a doctor at Ubauro Tehsil Hospital.

Ubauro is a town in Ghotki district in Sindh.

Four children were playing with a box containing flammable material near the office when the explosion occurred, police said.

A bomb disposal squad was called in while the injured children shifted to Ubauro Hospital.