The U.S. has neutralized the Syrian chemical stockpile.

The U.S. has neutralized the Syrian chemical stockpile, U.S. President Barack Obama said Monday.

"The most lethal declared chemical weapons possessed by the Syrian regime were destroyed by dedicated U.S. civilian and military professionals using a unique American capability aboard the M/V Cape Ray," said Obama.

U.S. Secretary of State John Kerry said the neutralization of the stockpiles was completed ahead of the one year anniversary of the chemical weapons attack that killed more than 1,000 people.

Moreover, Kerry raised concerns about whether Syria had more chemical weapons and insisted that remaining chemical weapon production facilities should be destroyed.

"We also remain deeply concerned by reports of systematic use of chlorine gas in opposition areas," said Kerry. "Each and every one of these issues must be fully resolved."

Syria accepted a plan to remove its chemical weapons in 2013, following a chemical attack by terrorist group which killed nearly 1,500 civilians in the Ghotta suburb of Damascus in August 2013.