Washington, Sep 17 - The United States sold arms worth $4.5 billion to Pakistan between 2005 and 2008, says a Congressional report even as Washington has expressed concern about reported diversion of military equipment away from the war on terrorism to fight India.

An updated Congressional report released last month says Washington signed arms transfer agreements with Pakistan in excess of $3.5 billion in the year 2006 alone, 'ranking Pakistan first among all arms clients of the United States during that calendar year'.

Last week, former Pakistan president Pervez Musharraf confessed that bulk of US military aid to Pakistan had been diverted for fighting India. However, he later backed out as Washington expressed concern.

A State Department official said the US will 'take seriously any allegations like this', noting that a former president had made these claims. 'But simply we don't have the details to be able to respond to these allegations.'

According to the report, the total value of Pakistan's arms purchases from the US in 2006 nearly matches the total value of all Foreign Military Sales (FMS) programme purchases by Pakistan from the US for the period from 1950-2001 (more than $3.