WTO chief warns 'we must stop escalation' of trade tensions

BERLIN - World Trade Organization chief Roberto Azevedo warned Monday against a damaging "escalation" of trade tensions between the United States and other major economies, following a divisive G7 summit.

"We must stop this escalation of tensions, the tit-for-tat process is not going to be helpful... new sectors will be brought into the picture which is something that will harm everyone," he said.