London terror attack latest: Second man arrested over tube bombing

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Incident at London's Parsons Green Underground Station

(CNN) — British authorities have arrested a second man in connection with the bombing of a London Underground train on Friday, officials said Sunday.

The 21-year-old man was arrested late Saturday in Hounslow, west London, by detectives from the London Metropolitan Police Counter Terrorism Command.

The incident at Parsons Green station — when an improvised device exploded as a train pulled into the platform during Friday morning’s rush hour, injured 30 passengers.

“He was arrested under section 41 of the Terrorism Act and taken to a south London police station where he remains in custody,” police said in a statement Sunday.

The arrests are part of a major manhunt for the perpetrators of Friday’s attack. Police had previously arrested an 18-year-old suspect in the departure area of the port of Dover on Saturday. Dover is major port town about 80 miles southeast of London.

The teen was taken into custody “on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism,” authorities announced.

Meanwhile police were still searching a residential address west of London in Sunbury-on-Thames, Surrey, on Sunday, with residents from surrounding buildings evacuated as a “precautionary measure.”

Officers were seen entering and exiting a lilac-painted property on Cavendish Road, which had been cordoned off.

Reporters at the scene attracted attention from residents, some of whom said they would be surprised if anyone in Sunbury was connected with the incident.

The house is believed to be owned by an elderly couple known for fostering hundreds of children — including refugees — over the years and were honored by the Queen for their work with MBE (Member of the British Empire) medals in 2010, according to reports widely circulated in British media on Sunday. London’s Metropolitan Police has not yet confirmed this.

Threat level remains at ‘critical’ level

While the investigation continues, the UK terror threat level remains at its highest level of “critical,” meaning that another attack is considered “imminent.”

UK Home Secretary Amber Rudd said on the BBC’s “The Andrew Marr Show” that Sunday’s second arrest suggests the bombing at Parsons Green was not a lone wolf attack before quickly adding “but it’s too early to reach any final conclusions on that.”

Shortly after the explosion, ISIS claimed involvement via its Amaq news agency.

But when asked if ISIS may have had a hand in the attack, Rudd said: “It is inevitable that so-called Islamic State or Daesh will reach in and try and claim responsibility. We have no evidence to suggest that yet.”

Rudd said the government is releasing an additional £24 million ($32.6 million) for counterterrorism operations around the country, “particularly to support operations where they are protecting people in public places.”

In London, an increased number of police officers could be seen patrolling the streets over the weekend, particularly around “crowded places, iconic sites, transport hubs and ports,” police said in a statement.

The Parsons Green station reopened early Saturday.

Detectives had spoken to 100 witnesses by Saturday afternoon and are continuing to comb through hours of CCTV footage as well as videos and photographs sent by the public, Neil Basu, the senior national coordinator for counterterrorism policing said in a statement on Saturday.

“The public’s help remains crucial, and I urge anyone with information, no matter how significant they think it is, to continue letting us know,” he said.

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