THREE Chinese nationals and two Mauritanians have been abducted from a construction site in northern Mali when gunmen raided the site for equipment and took hostages, the army said. The raid took place 55 kilometres (34 miles) from the town of Kwala, a regular transit point for companies moving through Mali's desert north, the army said in a statement. Later that evening, gunmen attacked a road checkpoint in the country's central San region, around 400 km from Bamako, and killed three civilians, the army said in a second statement. No group has yet taken responsibility for either attack. Parts of…