Pakistan, June 25 -- Oil prices rose on Monday to extend gains from last week, bolstered as tensions remain high between Iran and the United States after US Secretary of State Mike Pompeo said "significant" sanctions would be announced on Tehran.

Brent futures were up 26 cents, or 0.4 percent, at $65.46 a barrel by 0544 GMT.

West Texas Intermediate crude was up 40 cents, or 0.7 percent, at $57.83 a barrel.

US President Donald Trump said last week that he called off a military strike to retaliate for Iran's downing of an unmanned US drone, and he said on Sunday that he was not seeking war with Iran.

But Pompeo also said "significant" sanctions on Iran would be announced on Monday aimed at further choking off resources that Tehran uses to...