The smugglers were intercepted by police at the border checkpoint.
Tips
mistakes
The 卡 here reads qiǎ (third tone), not the more familiar kǎ ('card'). The qiǎ reading means 'to wedge/block' - and it's the same one in 关卡 (guānqiǎ, checkpoint) and 卡住 (qiǎzhù, get stuck).
