CISF personnel have been part of Sukhbir's security detail since he became an MP.
Police sources said Sukhbir is high on the target of militant groups.
"He has Z-plus cover. Besides CISF, he has a cover of CRPF and Punjab Police personnel. As he is the Chief Minister's son, he comes under the CM's security cover also," they said.
Chief Minister Parkash Singh Badal has an NSG security cover.