April 19 Reuters Oil prices seesawed on Tuesday as investors fretted over tight global supplies after Libya halted some exports and as factories in Shanghai prepared to reopen post a COVID19 shutdown, easing some demand worries.

Brent crude was down 26 cents, or 0.23, to 112.90 a barrel at 0643 GMT, after rising more than 1 to 114.21 earlier in the session.

U.S. West Texas Intermediate crude fell 45 cents, or 0.42, to 107.76 a barrel, after rising to 108.92 earlier.

Prices came under pressure with the dollar trading at a fresh twoyear high. A firmer greenback makes commodities priced in dollars more expensive for holders of other currencies.

Both benchmarks rose more than 1 on Monday after hitting their highest since March 28 on political crisis in Libya. The country said it could not deliver oil from its biggest oil field and shut another field due to political protests.

The latest supply hit came just as fuel demand in China, the world39;s largest oil importer, was expected to pick up as manufacturing plants prepared to reopen in Shanghai.

Oil prices, however, are still vulnerable to demand shocks as China continues to impose tough COVIDrelated curbs.

For oil prices to take off on a sustainable trajectory, reopening mainland cities is necessary for translating into a sustainable economic rebound that supports oil demand, said SPI Asset Management39;s managing director, Stephen Innes.

OANDA analyst Jeffrey Halley noted that markets in Asia seemed content to…