Officials say Vietnam has moved mobile rocket launchers to several islands in the South China Sea. The move is likely to raise tensions with China in the disputed area. Western diplomats and military officials told the Reuters news agency that Vietnam moved the launchers to five bases in the Spratly Islands in recent months. They say these rocket launchers can attack Chinese military locations in the disputed waters. Reuters reports that the launchers cannot be seen from the air and have not yet been armed. But sources say they could be armed with rockets within two or three days. Vietnam’s foreign ministry said the information was “inaccurate” without giving any detail. In June, Vietnam's Deputy Defense Minister said the country had no such launchers or weapons in the Spratly Islands. But he added that Vietnam had the right “to self-defense to move any of our weapons to any area at any time within our sovereign territory.