CNN  — 

A BBC spokesperson said on Sunday that the British broadcaster is “urgently looking into” issues raised in the Channel 4 documentary on Russell Brand, which included allegations of sexual assault.

“The documentary and associated reports contained serious allegations, spanning a number of years. Russell Brand worked on BBC radio programmes between 2006 and 2008 and we are urgently looking into the issues raised,” a BBC spokesperson said in a statement.

On Saturday, British outlets The Sunday Times, The Times and Channel 4’s “Dispatches” published a joint investigation in which four women alleged Brand sexually assaulted them in separate instances between 2006 and 2013. One of the women said she was 16 and Brand was 31 at the time of the alleged assault in London.