THE HAGUE — Dutch police said Thursday that they had responded to a terrorist threat against a rock concert in the city of Rotterdam after receiving concrete information from authorities in Spain, where assaults last week left 15 people dead.

Few details about the episode Wednesday in the Netherlands were released, but police said they arrested a 22-year-old man at 2 a.m. Thursday in the Brabant region, southeast of Rotterdam, in connection with an investigation into plans for an attack at the Maassilo events site, where Allah-Las, a band from California, was to play.

Rotterdam police called off the concert after receiving the information from Spain about the site and time of the potential attack, and they said that tip had led them to the suspect. The man who was arrested, who was not identified, can be held for 72 hours. Police added that there was no longer an imminent threat.

In a radio interview Thursday, the Dutch minister of security and justice, Stef Blok, said the suspect might only have posted threatening messages on social media sites. “We look forward to hearing why he committed this idiotic action,’’ Blok told the station BNR.

He said while it was “obviously very annoying’’ to have to cancel the concert, “there was enough reason to do so.’’

The arrest of the suspect, whose house was searched by authorities, came five hours after a Spanish citizen driving a van with Spanish license plates was taken into custody in Rotterdam after gas canisters were found in his vehicle.

The driver was detained for questioning after the concert had been called off, but he appeared to have posed little danger, despite the discovery of the canisters. Authorities said he was drunk and that they had found nothing to link him to the terrorist threat. He was released Thursday night.

The discovery of the canisters was an immediate source of concern in light of the attacks in Spain by a terrorist cell that had similar canisters at a bomb-making factory in a house in the coastal town of Alcanar. The cell also used a van in its attack in Barcelona.

A blast on the evening of Aug. 16 that destroyed the house in Alcanar was initially attributed to a gas explosion, but investigators later determined that the cell had stored more than 100 canisters in the house and had been planning to use them for an even deadlier attack that had to be abandoned.

Unlike its neighbors, Belgium and Germany, the Netherlands has been spared direct terrorist attacks on its soil in recent years, although its citizens have been victims of attacks elsewhere.

Security has been visibly ramped up in recent months across Europe, but on prominent public squares in Amsterdam and Rotterdam, the police presence tends to be subdued, and it is still unusual to see an automatic rifle in the hands of Dutch authorities. At the seat of government in The Hague, parliament buildings are protected by well-armed national police officers, but government buildings are not.

Politically, however, there has been a change in thinking, said Ronald Kroeze, a political scientist at the Vrije Universiteit Amsterdam. “Whenever the prime minister, Mark Rutte, comments on terrorist attacks abroad, there’s a sense that we are lucky that it hasn’t happened here,’’ he said.

Mayor Ahmed Aboutaleb of Rotterdam said that officers had become suspicious of the van when they observed it starting and stopping several times. Police said the driver had appeared to be inebriated, and an officer who inspected the van noticed the gas canisters.

The driver, a mechanic, was detained, but bomb experts found nothing else of interest after conducting a search of the van.

A search of the driver’s house found nothing of significance, according to police, who checked his permit to carry gas canisters before he was released on Thursday night.

The members of Allah-Las, who were already at the venue when the warning came from Spanish authorities, were driven to an unknown location by police. The band, which is scheduled to play Thursday night in Warsaw, released a statement to The Associated Press saying its members were safe and thanking local authorities for their help. The mayor said the band was welcome to return.

Allah-Las, a breezy, throwback guitar-pop band based in Los Angeles, has released three albums on small independent labels since 2012, including its most recent, “Calico Review,’’ last year.