At least 12 residents have been killed and seven others injured in a massive fire at an elderly care home in western Sri Lanka, police said on Thursday.The fire broke out at the Mawapiya Sewana elderly care home in Angurwatota, about 65 kilometers south-east of Colombo in Kalutara district, around 5.30 pm on Wednesday. More than 70 elderly residents were at the privately run facility when the fire broke out.Police said 10 people were found dead at the scene, while two others died later in hospital. A total of 51 residents were rescued and taken to temporary accommodation in a nearby school. Treatment of the injured is continuing.Footage from the scene showed the building extensively damaged, with burnt furniture and equipment scattered throughout the complex. Firefighters, police officers and local residents worked together to control the fire and rescue survivors.Authorities have arrested the owner and director of the home on suspicion of causing the deaths due to negligence. A magistrate inquiry has also been held as investigators continue to investigate the cause of the fire.Initial reports suggest that a gas cylinder explosion may have contributed to the rapid spread of the fire, but police said the exact cause had not yet been established.