Games trade body Ukie said all its members "take their responsibility to their players, particularly children, very seriously".
Ukie chief executive Jo Twist said:
We welcome any guidance from the OFT [Office of Fair Trading] to clarify how they are interpreting the law and shall be taking our time to digest the proposed guidelines before responding fully to the OFT’s consultation.
More top news
Thirteen people were killed in the shootings on April 20 1999.
The Prime Minister’s grip on the Tory leadership has been dealt another blow as councillors call for her to go.
Stars have rallied round for Singleton, whose films include Boyz n The Hood and 2 fast 2 Furious.