The tragedy in Spain deepens: the number of victims from the fire that engulfed three discotheques rises to 13 (VIDEO)

The balance of the tragedy that happened in the Spanish city of Murcia, where the fire at around 06:00 in the morning destroyed the "Teatre" night club, has worsened.

Rescue teams are still searching for missing persons after the fire, which reportedly burned down three nightclubs located next to each other.

Four people have been injured, while emergency services in Murcia say the death toll could rise.

Diego Seral of Spain's National Police told reporters that the fire's destruction of the building was making it difficult to find victims and it was impossible to determine the extent of the fire.

"The identification of the bodies will take time," he said.

Meanwhile, outside the well-known disco, young people hugged and with tears in their eyes from the shock they have suffered are waiting to receive information about the missing.

"We left the disco 30 seconds to 1 minute before the alarms and all the lights went off, while the screams indicated that there had been a fire. "Five members of my family and two of my friends are missing," said one survivor.

A spokeswoman for the "Teatre" night club told reporters that the fire first started in the adjacent discotheque, "La Fonda", and then engulfed the other two clubs as several birthday parties were taking place in their premises.

The mayor of Murcia, Jose Ballesta, said that they are working to determine the cause of the fire.

"We are devastated," he said on the Spanish television channel 24h.

Ballesta also declared three days of mourning in honor of the victims and flags were flown at half-mast outside Murcia's town hall.