美联社新闻一分钟 AP 休斯顿爆炸火灾造成多人轻伤（在线收听）

This is AP News Minute.

It was Democratic debate night number 2 as ten more presidential candidates took to a stage in Detroit. Former Vice President Joe Biden defended his decades-old political record, as discussions covered health care, climate and race.

North Korea has announced that it tested a new multiple rocket launcher system. It could potentially boost their country's ability to threaten targets in South Korea, including US military bases.

President Trump has welcomed Mongolia's President to the White House. Talks focused on trade. Most Mongolian exports are shipped through China.

And more than three dozen people have suffered minor injuries after a refinery explosion and fire near Houston. ExxonMobil and county officials say they found nothing to raise concerns about air quality.