The children were found at an address in Essex on Sunday.
Military personnel could perform counter-terrorism duties if armed Metropolitan Police officers are unavailable.
The sample is now being recovered and checked before being shared for research.
Around 15,000 runners took part in the race on closed roads around the capital on Sunday.
Twenty women who were prompted to get checked after seeing a campaign on Lorraine joined together to record the song Golden.
The theme of the festival is Kings and Queens, with some creations drawing inspiration from celebrities and Alice in Wonderland.
The initiative has raised more than £100,000 for Mind, a mental health charity, since 2012.
Former US president Donald Trump said he knew Rishi Sunak was ‘smart’.
Some who received payments last year returned to government within months, the party said.
The leg to Manchester could be axed.
Home Secretary Suella Braverman intervened after officers refused to carry out armed duties following a murder charge in a London police shooting.
The zero carbon buildings minister said watering down climate pledges will impact Scotland’s targets.
The five-year-old Rothschild’s giraffe crossed land and sea to make the journey from Dublin to Blair Drummond Safari Park.
The Neolithic court tomb, first found in Co Armagh, was excavated to save it from quarrying work in 1966.
Around 15,000 runners were due to take part in the race on Sunday.
The US space agency will bring home the largest asteroid sample ever returned to Earth on Sunday.
A capsule of material collected from asteroid Bennu is expected to land at 3.55pm BST on Sunday.
The second Malton Roman festival saw modern-day legionaries and cavalry take to the battlefield.