The Election Commission has extended the date of revision of final electoral rolls in West Bengal from the 14th of next month till 28th of September. Talking to our correspondent in Kolkata today, the state electoral officer Mr. Sunil Gupta said, seven electoral observers are visiting the state tomorrow to verify the work of producing correct voter lists in different district of the state. Mr. Gupta also said that his team would also discuss the matter with senior district officials.