Some 1,900 people took part Monday in a terrorism-response drill at Tokyo Sky Tree based on the assumption that a toxic liquid like sarin was released on the 350-meter-high main observation deck.

Held about three weeks before the tower's May 22 opening, the first disaster drill to take place at such a high elevation was carried out jointly by the Tokyo Metropolitan Government and Sumida Ward.

Some 400 Sumida Ward residents and 1,000 employees of Tobu Railway Co., the tower's developer, took part by playing the roles of visitors, while the metropolitan fire and police departments and Self-Defense Forces teams provided first aid and evacuated people to a nearby school while engaging in decontamination efforts.