SINGAPORE (REUTERS) - Oil prices fell more than 1 per cent on Monday (June 3) to extend losses of over 3 per cent from Friday, when crude markets racked up their biggest monthly losses in six months amid stalling demand as trade wars fanned fears of a slowdown in the global economy.

Front-month Brent crude futures, the international benchmark for oil prices, were at US$60.97 at 0044 GMT. That was US$1.02 cents, or 1.7 per cent, below last session's close.

US West Texas Intermediate (WTI) crude futures were at US$52.71 per barrel, down 79 cents, or 1.5 per cent.

The drops followed price slumps of more than 3 per cent on Friday, which made May the worst-performing month for crude futures since last November.

Edward Moya, senior market analyst at futures brokerage Oanda in New York, said last month's crude oil price fall of more than 10 per cent was "the worst May performance in seven years as the escalation of the global trade war saw the global growth outlook crumble".

While Moya warned "geopolitical risks remain in place", he added that "oil remains vulnerable" because of a weakening demand outlook for crude.

"The US-China feud remains most critical to the global growth outlook, but the addition of trade tensions between the US and Mexico raised the slower demand picture for the Americas," he said.

RISING US SUPPLY

US bank Goldman Sachs said in a note published on Sunday that "escalating trade wars and weaker activity indicators have finally caught up with oil market sentiment".

Brent crude oil prices have dropped almost 20 per cent from their 2018-peak in late April.

"The magnitude and velocity of the move lower were further exacerbated by growing concerns over strong US production growth and rising inventories," Goldman said.

US energy firms this week increased the number of oil rigs operating for the first time in four weeks, and weekly production last stood at a record 12.3 million barrels per day (bpd).

That's pushed up commercial US crude oil inventories, which have increased by 8.4 per cent since the start of the year to 476.5 million barrels.

"With an increasingly uncertain macro outlook as well as rising US production and large available core-Opec spare capacity helping offset declining supply from Iran and Venezuela, we instead expect prices will likely remain around our 3Q forecasts and current levels, albeit with still high price volatility," Goldman said.

The bank's Brent price forecast for the third quarter of this year was US$65.50 per barrel.