A group of about 50 Sena activists protested outside the World Trade Centre complex, the venue for the 'Made in Pakistan Expo 2012,' in south Mumbai's tony Cuffe Parade locality, police said.
The activists shouted slogans and allegedly demanded that the exhibition be stopped, they said.
A spokesperson for the industry lobby Federation of Indian Chambers of Commerce Industry (FICCI), which is supporting the fair, confirmed that protest was staged outside the venue.
There are about 100 stalls put up at the fair by 58 Pakistani companies for which nearly 200 workers have come down here, president of Federation of Pakistan Chambers of Commerce and Industry (FPCCI), Haji Fazal Kadir Khan Sherani, told reporters.
Products at the fair include designers' collections showcasing Pakistani brands like Gul Ahmed, Signatures by Five Star, Nisha Summer Lines and Al Karam among others, a FICCI statement said.
The exhibition that was inaugurated today is scheduled to close on September 5.
