Google and Yahoo are set to drop their proposed ad alliance possibly as early as next week because of antitrust objections by the Justice Department, the Wall Street Journal reported Friday.
The report came a day after officials from the two companies met with regulators and appeared to be unwilling to make the compromises needed to satisfy Justice Department concerns that their combined power would overwhelm the online advertising market.
The deal was announced in June and proposed that Google start selling its search ads throughout Yahoo's US properties.
The demise of the plan would represent another tough blow for Yahoo, which had hoped that the tie-up with Google would help it boost revenues after it rejected a
47.5-billion-dollar takeover bid from Microsoft. A collapse of the planned venture between the two biggest online advertising companies would deprive Yahoo of as much as 450 million dollars in operating cash flow over a year, according to estimates.

Shares fell 2.1 per cent Friday on the Seoul stock exchange on general recession fears. South Korea's won dropped against the dollar.
When the Spirit rover landed on Mars five years ago, no one expected it or its sister rover Opportunity to make it to their first birthdays, let alone their fifth.
Amelie Mauresmo fell victim to a leg injury after less than half an hour on court Friday to hand over a 4-0 victory which put French compatriot Marion Bartoli into the final of the Brisbane International.
Mumbai-based movie Slumdog Millionaire won five prizes Thursday night at the Critics Choice Awards, cementing its position as a surprise favourite just as the Oscar season moves into high gear.
After the Taipei Zoo received two giant pandas from China, another Taiwan zoo said Friday it is seeking to receive a pair of pandas from China.