The police have launched a probe into the blast that left two children injured at a house at Choondupurathu at Koduvally on Monday.
The explosive went off when Abid Rehiman and Jitheb were playing in the courtyard of the house in the morning. Both suffered minor injures on the hand and face.
The children were admitted to the Kozhikode Government Medical College Hospital.
The incident occurred at the house of P.T. Sadasivan, the district secretary of Karshaka Morcha. CPI(M) local leaders have demanded a comprehensive inquiry into the incident.