Agencies (Qasioun) - Google's European boss has apologised after adverts from major firms and government agencies appeared next to extremist content on its YouTube site.
It came after Marks and Spencer became the latest firm to pull its online ads over the issue, joining others such as Audi, RBS and L'Oreal.
Google's European chief, Matthew Brittin, promised to review the firm's policies and strengthen enforcement.
But some questioned the company's commitment to tackling the issue.
Mark Mulligan, a media and technology consultant at Midia said Google was likely to weather the storm, but that such incidents would weaken its dominance of the online advertising market.
"Every incident like this gives Facebook an opportunity to steal a march on Google," he said.
Source: BBC NEWS