Seoul: In a horrifying incident, at least 150 people were killed and many injured severely in a stampede took place at a Halloween event in Central Seoul late Saturday. According to the reports, tens of thousands of people gathered together to celebrate Halloween in a narrow downhill alley near Hamilton Hotel. As per the reports, 150 people including two foreigners were killed in the accident and 150 were injured severely. Officials said that the death toll may be increased. Many people suffered cardiac arrest during the stampede. The exact reason behind the stampede is not yet known.