New Delhi
The identity of the trespassers has not been ascertained yet.
The men shouted slogans of 'Hindu Sena zindabad' and 'CPI(M) murdabad'.
Incidentally, party general secretary Sitaram Yechury was about to enter the party's central committee meeting hall on the first floor of the office to brief the media.
He was to brief the press on the conclusion of the CPI(M) politburo's two-day meeting here.
The Delhi Police had also deployed heavy security in view of Kerala Chief Minister Pinarayi Vijayan's presence at the meeting.
Vijayan has been facing flak from some right-wing organisations over his criticism of the Centre's recent notification relating to cattle slaughter.
Visit news.dtnext.in to explore our interactive epaper!
Download the DT Next app for more exciting features!
Click here for iOS
Click here for Android