The guerrillas of Jharkhand Liberation Tiger (JLT) raided Hulsu village situated on the outskirts of Ranchi late Sunday.
Around 10 to 15 JLT Maoists abducted three youths Alok, Mahabali and Bhola, and later killed them by slitting their throats.
The incident is said to be a result of the Maoists' effort to establish their supremacy. Police have launched an operation to arrest the Maoists involved in the killing.
In the other incident, Maoist guerrillas set a bus on fire in Gumla district early Monday. The bus coming from Ambikapur of Chhattsigarh to Ranchi was stopped by the Maoists near Khatkor village of the district, some 140 km from here.
The passengers were asked to disembark, and the bus was later torched by the guerrillas of the JLT, which is also called People's Liberation Front of India (PLFI), police said.
The PLFI has called shutdown in five districts of the state Monday.