BRUSSELS, Nov 24 (Reuters) - The EU Commission on Monday

said it had unconditionally approved Omnicom Group's ( OMC )

$13.25 billion all-stock deal to buy rival Interpublic Group

.

The deal, announced last December, merges the world's

third-largest ad buyer, Omnicom ( OMC ), with the fourth-largest which

is Interpublic.

It would create the world's largest advertising agency as

traditional players look to better compete with Big Tech firms

amid the accelerating use of AI.