NOIDA, April 18 -- Tensions around worker unrest briefly resurfaced in Noida on Friday as political activity intensified at the Delhi-Noida borders, where delegations from opposition parties were stopped by police while attempting to enter the city to meet agitating workers, officials and leaders said.

According to police, a protest was reported in Sector 8 around 9am, when a group of workers gathered outside a company. "Upon receiving information, a team along with senior police officials reached the spot and counselled them. They later dispersed and returned to work," a senior police officer aware of Friday's developments, requesting anonymity, said.

Officials said police personnel have been deployed outside companies across industria...