Border guard officers checked the barges on June 30.
According to the city's Border Guards Department, the large-scale barges equipped with high-capacity machinery were found dredging sand from the sea at around 4am.All the barges owners failed to show their permits for dredging sand in the area.
The large-scale barges are equipped with high-capacity machines.
The border guards said that three other barges were also detained here a day earlier for illegal sand dredging.
The department is co-operating with local authorities to deal with the case.
