Two top US generals met with the Turkish army's second-ranking officer on Tuesday to discuss measures to crack down on Kurdish rebels based in northern Iraq. "The issues of Iraq, the ongoing cooperation against the common enemy, the PKK, and comprehensive intelligence sharing were discussed," the military said in a statement. Turkey has massed troops on its border with Iraq and has been weighing a cross-border attack against the Kurdistan Workers' Party, or PKK. Tuesday's talks - between Gen. James Cartwright, the vice chairman of the US Joint Chiefs of Staff, Gen. David Petraeus, the top US commander in Iraq, and Turkey's Gen. Ergin Saygun - lasted a few hours, US officials said, but no further details were available. A US embassy statement said the meeting was a "follow-up" to the meeting between Bush and Erdogan.