Police said a clash between rival groups was reported from Warsaliganj in Nawada in which three people were injured.
Similar incidents also took place at Belaganj in Gaya and Aurangabad.
Police in Chakand in Gaya opened fire in the air to disperse troublemakers who were attempting bogus voting at a polling booth.
Also, five cane bombs - two in Gaya and three in Aurangabad parliamentary constituencies - were recovered from near polling booths.
