The two suspected operatives are believed to be natives of Sambhal district in Uttar Pradesh.
Police refused to disclose the names of the operatives and the organisation they belong to.
Special Cell teams are conducting search operation at several places across UP, tracking other potential operatives of the jihadi outfit, a police officer said.
The two youths detained by the police were already under the Special Cell's scanner.
The two youths were detained today from Delhi following intelligence input suggesting their presence in the national capital.
The police have obtained certain leads suggesting that the duo, along with their associates, were allegedly planning strikes in the national capital during Christmas and New Year season, the officer said.
It is also believed that the duo attended training facilities allegedly set up by LeT, the officer added.
Earlier this month, the Special Cell had registered a case in connection with the presence of two suspected LeT operatives who allegedly infiltrated from PoK and were seen in the national capital, where they are allegedly hatching plans to target high profile individuals.
