A European Union official says the 27-country bloc is set to announce anti-dumping levies on Chinese solar panels — a move that could trigger a trade war between two of the world's largest economies.

The official said Trade Commissioner Karel de Gucht will announce the tariffs later Tuesday. He spoke on condition of anonymity pending the official announcement.

China is the world's largest producer of solar panels — its exports to Europe totaled 21 billion euros in 2011 — but it has been accused of selling them below-cost to corner the market.

The EU Commission, the bloc's antitrust authority, confirmed de Gucht will present the outcome of investigation but declined to elaborate.

The Commission has proposed a 47 percent special duty on the Chinese solar panels.