A huge explosion and fire broke out Thursday in the central Dutch city of Utrecht, with at least one person injured, according to officials.There was a “gigantic explosion,” Dutch news agency ANP cited a spokesperson for the local fire brigade as saying.It was not immediately clear what caused the blast nor whether there were more victims.For all the latest headlines, follow our Google News channel online or via the app.Officials called on the local population to stay away from the area, as emergency services rushed to the scene.“It's also possible that there are still people under the rubble,” city mayor Sharon Dijksma told public broadcaster NOS.TV images showed a plume of smoke rising above the historical city center and rubble strewn across the streets.“I knew right away that this was bad,” NOS quoted one witness, Margot Schroevers, as saying. “The ground was shaking,” she said.The local hospital in Utrecht has set up an emergency trauma center. The Red Cross urged volunteers to