Two troopers of Assam Rifles were injured in twin bomb blasts at the Polo ground in Imphal on Monday.
The two troopers were rushed to hospital for treatment and are out of danger.
No organisation has claimed responsibility for the blasts so far.
In January, two bomb blasts targeted the offices of the Indian Army and the Assam Rifles near Raj Bhavan, injuring a woman.
“Security for governor of Manipur Najma Heptulla has been heightened. Police have registered a case and investigation is progressing,” said a senior police officer.