The Beijing transport authority has intensified efforts to crack down on illegal taxi services through car booking apps.

The Beijing Commission of Transport has sent 10 inspection teams this week to popular destinations including Beijing Capital International Airport to catch the cars providing taxi service without a license.

Seven private cars were found providing an illegal taxi service at the airport on Tuesday when they were charging service fees to passengers who were using smartphone apps. The apps included Yidaoyongche, Didizhuanche and Taobao. The team at the airport said four to five illegal cabs were detected on average each day.