WASHINGTON, April 11 (Xinhua) -- U.S. President Donald Trump taunted Russia on Wednesday that missiles "will be coming" to Syria, as Washington was mulling a response to the suspected chemical weapons attack.

"Russia vows to shoot down any and all missiles fired at Syria. Get ready Russia, because they will be coming, nice and new and 'smart!'" said Trump in a tweet on Wednesday morning.

"You shouldn't be partners with a Gas Killing Animal who kills his people and enjoys it!" Trump tweeted.

Trump has accused "President Putin, Russia and Iran" responsible for the attack due to their backing of the Syrian government in a tweet over the weekend.

Rebutting Trump's tweet on Wednesday, Russian Foreign Ministry spokesperson Maria Zakharova said on Facebook later in the day that a missile strike could undermine the work of international inspectors who will examine the site of the suspected chemical attack.

The so-called "smart" missiles should be fired at terrorists, not at the legitimate government which has been fighting terrorists, Zakharova wrote.

Trump has been mulling a response to the alleged "chemical attack" on Saturday, with the possibility of U.S. military actions against the Syrian government looming large.

Activists, local rescuers, and rebels in Syria claim that Syrian government forces used chlorine gas on Saturday in an attack in Douma, a rebel-held area near capital Damascus.

The Syrian Foreign Ministry has denied the accusations, calling rebels' claims "premeditated pretexts."