Oil prices slid on Friday but are set for their first weekly increase this month as talk of a coordinated plan by producers to freeze output levels was tempered by a record build in U.S. crude inventories. Brent futures LCOc1 were down 35 cents at $33.93 a barrel by 0957 GMT, with U.S. crude CLc1 slipping by 36 cents to $30.41. Oil prices had risen by more than 14 percent earlier in the week on Saudi Arabia and Russia’s agreement to freeze output at January levels. While Iranian Oil Minister Bijan Zanganeh welcomed the plan, he fell short of committing to it and Iranian sources told Reuters that capping output is not enough to rebalance the market. Saudi Arabia reiterated that it has no plans to cut output and will continue to protect its market share.