(CNN) -- A fire at a karaoke bar and discotheque in Medan, in Indonesia's North Sumatra province, killed at least 20 people Friday night, according to a hospital. At least two people survived, according to Aida Sofiati of the Pringadi Hospital in Medan. Sofiati said 20 people were killed. Mohammad Zein, a fire official, said the blaze started around 10 p.m., but firefighters were able to extinguish it within a half-hour. He said the cause of the fire was not known.
Blaze hits karaoke bar and discotheque in Medan, in North Sumatra province . Medan hospital official says at least two people survived . Fire official: Fire started around 10 p.m., was extinguished within half-hour; cause isn't known .