Pakistan, May 22 -- Oil prices rose on Friday as investors remained uncertain about the prospects of a breakthrough in ongoing negotiations between the United States and Iran, despite signs of limited diplomatic progress.

Read More: Oil prices fall below 100 dollars on Iran deal hopes

Global benchmark Brent crude climbed 1.6 per cent to more than $104 a barrel, while US West Texas Intermediate crude also gained over one per cent in early trading. However, both benchmarks remained on course for weekly losses after volatile trading driven by shifting expectations surrounding the talks.

Officials from Washington and Tehran have recently indicated that some progress has been made, but major disagreements continue over Iran's uranium stockp...