"I want to put this question to the world... is Pakistan's nuclear arsenal safe?" Singh said while addressing troops at a base in Srinagar in Indian-administered Kashmir.

"Pakistan's nuclear arsenal should be brought under the scrutiny of IAEA (International Atomic Energy Agency)."

Singh's comments came as the nuclear-armed rivals ended their worst military conflict in nearly three decades with a ceasefire announcement on Saturday.

The conflict sparked global concerns that it could spiral into a full-blown war.

The fighting began last Wednesday when India launched strikes against what it described as "terrorist infrastructure" in Pakistan.

Pakistan immediately responded with heavy artillery fire and a four-day standoff ensued between the South Asian rivals, which left around 70 people dead on both sides.

India claims Pakistan backs the militants it says were behind an April attack in which 26 people were killed in Indian-administered Kashmir -- a charge Islamabad denies.

India denied targeting Pakistan's nuclear installations during the brief conflict.

"We have not hit Kirana Hills," Indian Air Marshal A.K. Bharti told reporters, referring to a vast rocky mountain range where, according to Indian media reports, Pakistan stores its nuclear arsenal.