An explosion at a chemical factory in Weifang, a city in eastern China, has caused at least five deaths and injured 19 people. Six people are still missing. The explosion happened at a factory owned by Gaomi Youdao Chemical Co., which makes pesticides and medical chemicals. The blast broke windows in nearby buildings and sent a lot of smoke into the sky. Students at a nearby school said they smelled something strange after the explosion. More than 230 emergency workers went to the site, and a team was sent to check for possible pollution. This event happened after a national meeting that aimed to make the chemical industry safer. This shows that there are still safety problems in China's workplaces. Last year, the Gaomi Youdao factory was praised for managing risks well, because they had found and fixed over 800 safety problems.