By Rodrigo Campos

NEW YORK (Reuters) - Stocks, the dollar and oil prices fell on Friday while safe havens rose after President Donald Trump demanded U.S. companies look at alternatives to China for manufacturing, following Beijing's retaliatory tariffs on American goods.

China's Commerce Ministry said in a statement early on Friday it would impose tariffs on about $75 billion in imports from the United States including some agricultural products, crude oil and small aircraft.

Trump responded mid-morning in a series of tweets, writing that "American companies are hereby ordered to immediately start looking for an alternative to China."

Trump cannot force U.S. companies to abandon China and he gave no detail on how he might proceed with any such order. But his series of tweets was seen as a harbinger for yet another escalation of the trade war.

After markets closed in New York, Trump tweeted the United States would raise tariffs on $250 billion worth of Chinese imports to 30% from 25% beginning Oct. 1.

"Additionally, the remaining 300 BILLION DOLLARS of goods and products from China, that was being taxed from September 1st at 10%, will now be taxed at 15%," he wrote.

The morning's tweets "certainly heightened concerns about trade and its drag on global growth," said Craig Bishop, lead strategist of the fixed income group at RBC Wealth Management at Minneapolis.

"It has heightened chances of a recession. The President is his own worst enemy when he tries to manage both fiscal and monetary policies."

Stocks that benefit during economic expansions fell the most on Wall Street, also hinting at recession concerns.

"There is a lot of worry here. I would say what (Trump) is tweeting is disconcerting. It's a fair reaction from the markets. I don't think anyone thought we'd get to this level," Michael O'Rourke, chief market strategist at JonesTrading, said during market hours.

The Dow Jones Industrial Average <.DJI> fell 623.34 points, or 2.37%, to 25,628.9, the S&P 500 <.SPX> lost 75.84 points, or 2.59%, to 2,847.11 and the Nasdaq Composite <.IXIC> dropped 239.62 points, or 3%, to 7,751.77.

The pan-European STOXX 600 index <.STOXX> turned sharply lower after Trump's tweets, dropping 1% in the last half hour of trading to close down 0.78%, while MSCI's gauge of stocks across the globe <.MIWD00000PUS> dropped 1.57%.

Emerging market stocks lost 0.20%, an index of Latin American shares <.MILA00000PUS> dropped more than 3% to close at its 2019 low and U.S. dollar-denominated Nikkei futures <NKc1> fell 2.0%.