"Some of them have been involved in terrorist activities. They had reached Kathmandu from Pakistan and from there crossed over into India at Sonauli," Commandant Sashastra Seema Bal B K Bankhoti told PTI.
The group, including two women and four children, which was detained on Saturday, has been sent to the Jammu and Kashmir Police cell in Delhi by road, he said.
Bankhoti said the SSB, which guards the 1,751-km long Indo-Nepal border, would be accompanying the group till Delhi, from where central intelligence agencies will take over.
These persons were detained by the security personnel as they did not have valid documents, he said.
During interrogation, they told SSB personnel that they belonged to Jammu and Kashmir and were coming from Kathmandu.
Image: Paramilitary soldiers patrol the Indo-Nepal border
Photograph: Rupak De Chowdhuri/Reuters