KARACHI (Reuters) - Pakistans foreign exchange reserves fell to $16.74 billion in the week ending Nov 27, down from $16.85 billion the previous week, the State Bank said on Thursday. Reserves held by the State Bank of Pakistan (SBP) eased to $12.97 billion from $13.11 billion in the week ending Nov. 27, while those held by commercial banks rose to $3.77 billion from $3.74 billion, said the State Bank of Pakistan. The State Bank of Pakistans reserves fell due to debt payments, said Syed Wasimuddin, chief spokesman of the central bank. Pakistans reserves hit a record high of $17.10 billion in the week ending Oct 15 because of an increase in remittances from overseas Pakistanis and a narrowing trade deficit. They were further boosted in September after the IMF sent Pakistan $450 million and said that the money would go toward the budget to help with additional spending for flood relief and immediate foreign exchange needs. This was separate from the $11 billion IMF bailout programme, agreed in 2008. In May, Pakistan received $1.13 billion, the fifth tranche of the programme. The IMF is likely to delay the possible release of the sixth tranche because of the slow implementation of fiscal reforms.