Rain has fallen in China’s northeastern port city of Tianjin, where two large chemical explosions occurred last week. Officials there are trying to prevent the spread of dangerous chemicals and explosives from the site.

Officials have assured the public that measures are in place if the chemicals spread. However, it was not immediately clear whether Tuesday’s rain would cause the spread of toxic chemicals and dangerous materials.

Authorities say some 3,000 tons of hazardous materials were stored at the site at the time of the explosions last week. The chemicals included sodium cyanide and potassium nitrate.