The incident took place around 5:50 pm in Minuthong area, a senior police officer said, adding, the two medium-intensity blasts occurred within a span of two seconds.
The troopers sustained splinter injuries and are reported to be out of danger, the officer said.
Today's incident comes a day after two Assam Rifles jawans sustained splinter injuries when hand grenades were lobbed at them at the Imphal Polo Ground.