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Barcelona attack: House explosion which killed one is connected with van strike, police say Barcelona attack: House explosion which killed one is connected with van strike, police say
(35 minutes later)
One person was killed and at least seven injured in an explosion at a house in Catalonia which investigators are linking to the Barcelona attack, police said.  One person was killed and at least seven were injured in an explosion at a house in Catalonia which investigators are linking to the Barcelona attack, police said. 
The blast, which took place on Wednesday night in Alcanar, was reported to have hurt police officers and firefighters.  There are suspicions that the blast points to a larger plot which went wrong. 
It is believed the explosion was caused by butane gas. The explosion, which took place on Wednesday night in Alcanar, was reported to have hurt police officers and firefighters. 
Around 20 bottles of it were reportedly found within the ruins of the house.  One of the attack suspects was arrested in the town on Thursday, which lies around 120 miles south of Barcelona. 
Analysts said the amount of gas found in the house was too much for normal use, and possibly indicated plans for a further attack. It is believed the explosion was caused by butane gas, but the circumstances are unclear.
Alcanar lies around 120 miles south from Barcelona.  Around 20 bottles of it were reportedly found within the ruins of the house, which was totally levelled. 
More follows… Several other nearby houses were also damaged. 
  Analysts said the amount of gas found in the house was too much for normal use, indicating plans for a large bomb attack.
On Twitter, security analyst Aldin Abazovic speculated: "Two rented vans plus this amount of gas bottles, result is a two solid SVBIEDs [Suicide Vehicle-Borne Improvised Explosive Device]. 
"Just a theory of course."
At least 13 people were killed today and 100 injured when a van rammed into a crowded street in Barcelona. 
The driver is believed to have escaped.