"We pray for the speedy recovery of those who were injured in this explosion", Cayetano said, urging members of the Filipino community in London to remain vigilant.
A second man has been arrested in connection with a suspected terror attack on a London Underground train on Friday.
"We are still pursing numerous lines of enquiry and at a great pace", counterterrorism co-ordinator Neil Basu of the London police said late Saturday.
In May, a suicide bomber killed 22 people at an Ariana Grande concert in Manchester.
On Friday, a improvised explosive detonated on the London Underground at Parsons Green tube stop, injuring 30 people.
The UK has witnessed a series of attacks this year, with the bombing of a concert in Manchester in May, a stabbing spree around the London Bridge area in June and a March attack in which a man drove a auto into crowds on Westminster Bridge.
Sign language interpreter accused of signing gibberish during Irma conference
County leaders have faced the brunt of the criticism for failing to organise an interpreter despite days of weather warnings. McCarthy was alarmed when she saw the briefing and said her company usually provides deaf interpreters to the county.
Airtel new offer
As the popular Monsoon offer comes to an end, the largest telecom operator is making sure its users get the best benefits. You should note that this offer is only applicable for postpaid users, so it will not work for prepaid numbers.
Kevin Hart I'm Being Extorted Over a Sexually Suggestive Video
I made a bad error in judgement putting myself in an environment where only bad things can happen, and they did. In doing that I know that I am going to hurt the people closest to me, who I've talked to and apologized to.
The device detonated in the rear auto as the train - headed to Edgware Road - was just arriving at the Parsons Green station in southwest London.
Friday's detonation was considered by police to have been partial.
The suspect was identified by security services from CCTV footage, according to multiple British media, quoting police.
Basu also said that the investigation continued and the threat level remained at critical.
The Islamic State group said an IS detachment had been behind the bombing.
The "critical" level of threat means that an attack is expected imminently.
She said that due to the high threat of terrorist attacks in the coming days to the protection of sites, public access to which is restricted, will involve the military.