US Congress on Friday passed a bill that sets tough new restrictions on military assistance to Pakistan and seeks determination from Obama administration that the fund will not be used to affect the 'balance of power in the region'.

The Defence Authorisation Bill for 2010 includes the amendments by Senators Bob Menendez and Bob Corker, according to which the Secretary of Defence and the Secretary of State are required to give a determination that the payment is both in the national interest of the US and it will not affect the balance of power in the region.

The determination has to be given before Pakistan is reimbursed with Coalition Support Fund. The new limits also include efforts to track where US military hardware sent to Pakistan ends up.

US Senate voted 68-29 in favour of $680 billion defence spending bill, which was earlier adopted by the House of Representatives by a vote of 281-146 on October 8. The bill now goes to President Barack Obama for his approval.

The move came as Pakistani military fought through the sixth day of a major offensive against militants in the restive South Waziristan, a Taliban stronghold.

"We can't lose sight of the very reason Pakistan receives these funds: they are a reimbursement for expenses incurred fighting terrorists and supporting US-led efforts to do the same," Menendez, a Democrat from New Jersey said.

"That fight is important to our own national security, and we have to ensure that our support for it is not being squandered or diverted. It is not only right for us to ensure that American taxpayer money does what it is intended to do, it is our duty as stewards of the national security and of taxpayer money," he said.

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