Extending overnight losses for almost the same reasons, the rupee hit an all-time low of Rs298.93 against the US dollar in the interbank market on Thursday. In the open market, the local currency lost Rs2 to settle at 299. Meanwhile, the foreign exchange reserves of the State Bank of Pakistan (SBP) declined by $74m to $4.38bn for the week ending on May 5, the central bank reported on Thursday.