Chinese authorities say three people have been injured by a small explosion at the check-in area of Shanghai's Pudong airport.

The airport's management said on its microblog that the blast occurred at 2:20 p.m. (0620 GMT) in the airport's T2 check-in area and appeared to have been caused by some sort of home-made explosive.

It said the three people had been taken to a hospital but gave no word about their condition. It said there was no disruption to flights in or out of the busy airport.