They have been named as: Gurpreet Singh Ottalan, 21; Onkar Singh Sangha, 21; Narinder Kumar, 25; Jasbir Singh Takhar, 22; Neesha Dubb, 19; Jarnal Singh Bajwa, 34, and Sukwinder Singh Sanghera, 23.

In addition, a 17 year-old man was arrested Friday and another man, aged 23, has been released on bail pending further enquiries, police said.

Detective Chief Inspector Joanne Clews has urged anyone with information to contact the Major Investigation Unit at West Bromwich police station on 0845-113-5000 or call Crimestoppers anonymously on 0800-555-111.

'If someone has information and is worried about coming forward, please be assured there are a number of ways in which we can help,' she said.