Seoul, Sep 3 : A day after the North fired cruise missiles following major joint exercise between South Korea and the US, North Korea has conducted a drill for a "simulated tactical nuclear attack."

"Two long-range strategic cruise missiles tipped with mock nuclear warheads were fired," Yonhap news agency reported quoting the KCNA.

On Saturday, South Korea's Joint Chiefs of Staff said the North fired several cruise missiles toward the Yellow Sea at around 4 a.m. The launch came two days after the allies wrapped up their 11-day Ulchi Freedom Shield exercise which Pyongyang has denounced as a rehearsal for invasion.