FWIW...
The story has said nothing yet about a
thrown grenade - it consistently referred to having "
detonated" either a "grenade" or an "explosive device" of some sort.
The story has further stated - "One of the kidnappers is believed to have been wearing a
suicide vest and standing beside Norgrove when
it detonated."
There are a number of ways such a vest or a grenade might be detonated, wilfully or by accident, by either the wearer or an attacker under such an operation.
The UK refers to all SOF as SF - it goes back to WW2 when the SOE wore the jump wings with the round red circle between the white wings and white 'SF' letters in the red circle.
Richard's $.02
