The US has taken very seriously the reports about illegal modifications made in the American-made Harpoon anti-ship missile by Pakistan, to expand capabilities to strike land targets, a potential threat to India, even as Islamabad has agreed for mutual inspections.

"This is something that we take very seriously. We have raised the issue with the Pakistani government. The (Pak) government has responded with an agreement in principle for mutually agreed inspections," the Assistant Secretary of State for Public Affairs PJ Crowley, said when asked about a news report published in The New York Times.