Amir Amin, a resident of Shopian district in Jammu and Kashmir, was detained from near the Sector 9 bus stand in Dwarka area.
A passer-by noticed him displaying a placard and made a call to the Police Control Room, a police officer said.
He is a resident of the Palam Extension area since January 5, the police officer added.
Amin, a postgraduate, was brought to the national capital by an organisation named UDAAN, which provides vocational training to unemployed youth, a police officer said.
"A PCR call was recieived at 2.39 p.m. at the Dwarka South police station regarding a man supporting a terrorist," Deputy Commissioner of Police (South West) Surender Kumar told IANS.
He is presently being questioned.
Apart from his parents, Amin has three younger sisters in his family.
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