LONDON (Reuters) - Google parent Alphabet has urged a London tribunal to block a mass lawsuit which accuses it of abusing its dominance in the online advertising market, in the latest case to focus on the search giant's business practices.

The lawsuit seeks damages of up to 13.6 billion pounds ($16.9 billion) on behalf of publishers of websites and apps based in the United Kingdom, who say they have suffered losses due to Google's allegedly anticompetitive behaviour.