One person was missing after a building collapsed in a central Madrid explosion, Telemadrid broadcaster said on Wednesday.
A reporter for TVE public broadcaster said several people had been injured, without giving details. Emergency services could not immediately confirm if there had been injuries.
A Reuters reporter saw smoke coming out of the collapsed building and rescue workers evacuating elderly people from a nearby nursing home.
The collapsed building was a religious complex that provided residential training for priests and gave meals for the homeless, a neighbor told Reuters.
A police spokeswoman said the area was being evacuated but could not confirm the source of the explosion.
La Sexta news channel quoted government sources saying it may have been a gas leak. Officials could not immediately confirm.
The explosion happened on Toledo Street, in the city center.