Four persons allegedly linked to the banned Popular Front of India (PFI) were arrested by Delhi Police under the stringent Unlawful Activities (Prevention) Act, officials said on Tuesday.

This is the first arrest of any PFI member in the national capital after the outfit was banned by the Centre on September 28. Earlier, Delhi Police had conducted raids at PFI units spread across six districts of the city and detained 33 people allegedly linked with the group.