KARACHI (Reuters) - Pakistans foreign exchange reserves rose to a record $17.20 billion in the week ending Jan 1, up from $16.42 billion the previous week, the State Bank said on Thursday. Reserves held by the State Bank of Pakistan (SBP) rose to $13.53 billion from $12.71b in the week ending Jan. 1, while those held by commercial banks fell to $3.67 billion from $3.71 billion, said Syed Wasimuddin, chief spokesman of the central bank. Pakistan received more than $633 million from the US for providing military and logistical support to fight militancy, boosting reserves, Wasimuddin said. Pakistans reserves previously 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. Earlier the reserves got a boost in September after the International Monetary Fund 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 International Monetary Fund bailout programme, agreed in 2008. In May, Pakistan received $1.13 billion in the fifth tranche of the programme.