Eight persons were injured when a gas cylinder exploded in a first-floor house of a building in Lalubai compound,Govandi,on Thursday. Five persons were taken to Rajawadi Hospital. The patients have suffered 10 to 20 per cent burns. They will be discharged soon, said an official of the Brihanmumbai Municipal Corporations disaster management cell. The explosion took place around 9 am in building no. 69 of the B wing.