US agrees a co-operation pact with India despite nuclear proliferation concerns.
The test came a day after the US House of Representatives approved legislation allowing shipments of civilian nuclear fuel to Pakistan’s nuclear-armed neighbour, India.
Critics says the nuclear deal between Washington and New Delhi could trigger an arms race in South Asia.
Pakistan became a declared nuclear power on May 28, 1998, when it conducted underground nuclear tests in response to those carried out by India. It tested its first missile the same year.