The Enforcement Directorate (ED) on Tuesday carried out raids at 12 locations in the national capital and at other places in connection with the National Herald case in which top Congress leaders are accused of violating norms.

The National Herald case pertains to the alleged financial irregularities under the Prevention of Money Laundering Act (PMLA) and was registered about nine months ago after a trial court took cognisance of an Income Tax department probe carried out on the basis of a private criminal complaint filed by former Bharatiya Janata Party (BJP) MP Subramanian Swamy in 2013.