Emergency services could not immediately confirm if there had been injuries. A police spokeswoman said the area was being evacuated but could not confirm the source of the explosion. MADRID: A building collapsed in a central Madrid explosion, a Reuters reporter saw, with smoke coming out of the building and rescue workers evacuating elderly people from a nearby nursing home. A reporter for TVE public broadcaster said several had been injured, without giving details. A witness told Telemadrid broadcaster that there was at least one person trapped inside. Emergency services could not immediately confirm if there had been injuries. A police spokeswoman said the area was being evacuated but could not confirm the source of the explosion.