Metropolitan Police
They were held in London and Birmingham.
More than 200 officers were involved.
Suspect Bidhya Sagar Das is in custody.
The Met Police said the officer remained on restricted duties.
The victims will keep their payouts regardless of the outcome.
The horses were on an 'unlikely night out'.
21-year-old man found with a stab injury to his hand.
The victim remains in hospital.
'This is a historic day for London.'
The death is 'unexplained but not suspicious'.
About Metropolitan Police
The Metropolitan Police Service was founded by Sir Robert Peel in 1829. Today its head is commissioner Cressida Dick. The Met police has recently been subject to controversy over allegations some journalists gave money to police for information during the phone hacking scandal. A force is also known as "the Met", "Met Pol", "MP" and "the MPS" and has more than 31,000 officers together with about 13,000 police staff and 3,700 Police Community Support Officers (PCSOs). The MPS is also being supported by 2,500 volunteer police cadets and more than 5,000 volunteer police officers from the Metropolitan Special Constabulary (MSC) and its Employer Supported Policing (ESP) programme. The Metropolitan Police Services covers an area of 620 square miles and a population of 7.2 million.