The railway police suspected their movement in the railway station and intercepted the conversation of the team comprising six males and six females including children to ascertain their nationality.
Police told UNI that one human trafficker from Hyderabad was also arrested with input from the detainees.
During interrogation, it was revealed that they crossed over to India illegally breaching wire fencing along an isolated patch in Sonamura of Sepahijala district a day ago.
The Hyderabad man reportedly arranged their border crossing through a smuggler gang.
The foreigners were to be trafficked to the Middle East from Hyderabad, police sources told UNI.