"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.
ACCORDING TO BRADY: Is this what a changing climate looks like?
A major hurricane is one ranked as a Category 3 or higher, meaning it has a maximum wind speed of at least 111 miles per hour . The sub-headline of the Nation piece declared that Hurricane Harvey victims "have a murderer - and it's not the storm ".
Texas OT Connor Williams Leaves Game vs. USC with Knee Injury
After Texas defensive back Holton Hill slipped, Jones cut to his left and beat the secondary to the end zone. After two weeks of college football , there is a contest between two teams that used to be powerful rivals.
Klopp frustrated as Liverpool draw with Burnley
After a unremarkable spell at Chelsea, Salah has returned to the Premier League with Liverpool and taken the league by storm. Despite trailing in nearly every match stat, Sean Dyche's side held firm to continue its impressive start to the season.
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.