(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.
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question: At least how many people survived the blaze?, answer: two | question: what caused the blaze, answer: the cause of the fire was not known. | question: was anyone killed, answer: at least 20 people | question: At least how many people survived?, answer: two | question: Where is the city of Medan?, answer: Indonesia's North Sumatra province, | question: When did the fire start?, answer: around 10 p.m., | question: What did the blaze hit?, answer: karaoke bar and discotheque in Medan, | question: At what time did the fire in Medan start?, answer: 10 p.m., | question: when did thsi happen, answer: Friday night, | question: How many survived?, answer: At least two people | question: How many people survived?, answer: At least two | question: Where did the blaze hit?, answer: karaoke bar and discotheque in Medan, in Indonesia's North Sumatra province, | question: What province is Medan located in?, answer: North Sumatra | question: What places did the blaze hit?, answer: a karaoke bar and discotheque | question: When did the fire start?, answer: around 10 p.m., | question: What was the cause of the fire?, answer: not known.