It did not say which group or groups might be involved.

They also would not say which group had him in custody.

Police did not say which group the rebels belonged to.

I am surrounded half by barristers and half by Physicians, and cannot say which group I like less.

Police did not say which group the suspects were linked to but Mohamed said the women pledged allegiance to al Shabaab.

He declined to give his name or say which groups he had spied on.