"We're looking for evidence of it, since clearly we are dealing with the Assad regime that has used denial and deceit to hide their outlaw actions", he said.
The United States is investigating whether the Syrian government recently used sarin gas in attacks on the opposition, US Secretary of Defense Jim Mattis said Friday.
"We are even more concerned about the possibility of sarin use, (but) I don't have the evidence,"Mattis said".
The Syrian government may be developing new types of chemical weapons, and US President Donald Trump is prepared to again order military action against Syrian leader Bashar Assad's forces if necessary to deter chemical attacks, senior US officials said on Thursday.
AFP news agency also reported senior officials as saying the USA was not ruling out military force in response to future chemical weapons attacks by the Syrian government.
In 2013, Syria said it would give up all of its chemical weapons.
Last month, activists claimed the Syrian forces used chlorine in an attack on the rebel-held Eastern Ghouta countryside of Damascus, causing 21 people to suffer from breathing difficulties.
The April 2017 attack on Khan Sheikhun left scores dead and prompted the U.S. to fire 59 Tomahawk cruise missiles at a Syrian air field.
Last April, the USA military fired a barrage of missiles into Syria's Shayrat Airfield in retaliation for a chemical weapons attack that killed about 100 civilians.
French Foreign Minister Jean-Yves Le Drian said, "Those who carry out chemical weapons attacks need to be made aware that we know who they are, and we will go after them". Mattis hinted at such action on Friday, referencing a US missile strike on a Syrian military airfield past year.
These reports said toxic gas has been used.
In June previous year, the fact finding team of Organization for the Prohibition of Chemical Weapons (OPCW), published the results of its probe of the April 4 incident confirming that the nerve gas sarin was used in Khan Shaykhun incident.
After a buyout, the Hawks ended up owing Crawford $13.3 million - almost the same as the $14.3 million left on Asik's contract. The return of Mirotic saw a seven-game winning streak early on and the Bulls were beginning to surge at just the right time.
Almost six months after Hurricane Maria battered the USA territory, some places on the island still lack power and potable water. Thirty federal legislators had signed a bipartisan letter asking FEMA not to end assistance, according to the NYT.
But, the friendly skies can be notoriously hard on pregnant women in particular, and Khloe Kardashian is no exception. Khloe's little sister Kendall also posted a tribute, as the model said she'd "forever miss her kisses".
A student who was in the class when shots rang out said he thought the gunfire was an accident, CNN affiliate KABC reported. LAPD Detective Meghan Aguilar said a suspect - a female student - is in custody, adding that a weapon has been recovered.
EA's stock price went up on Monday after the Polygon news site reported that EA may be the target of a Microsoft acquisition. But a year ago, EA released Battlefield 1 and Titanfall 2, making for a tough comparison to year-ago figures.
Although breast cancer death rates have declined since 1989, over 40,000 American women die from the disease every year. The report said some heart damage , including the kind caused by drug Herceptin sometimes can be reversed.
Can I adopt Puppy Bowl dogs? Both Teddy and Tyler have been adopted but there are plenty of other dogs that still need good homes. This year, Animal Planet is featuring a handful of rescue groups from places devastated by nature including Shaggy Dog Rescue .
TASS reported that "according to preliminary information, the plane was shot down from a portable anti-aircraft missile system". Syrian government troops launched a major offensive around Idlib in late December, backed by Russian jets.
The WhatsApp new update for the Android users aims at ensuring that they can enjoy the same controls as the iOS counterparts do. That will likely push the release back by several more weeks, but there will be a beta program for 8.1 soon.
More civilian causalities due to Turkish operation in Afrin
Authorities initially said they believed the blast was a gas explosion but did not rule out the possibility of "sabotage". Ercan Topaca said three people had sustained light injuries from flying debris at the scene of Thursday's explosion.
Famous Groundhog, Punxsutawney Phil Prediction Revealed for 2018
On Gobbler's Knob in Punxsutawney, Phil's "Inner Circle" - garbed in top hats and tuxedos - announced his prediction at 7:25 a.m. The event now attracts up to 30,000 visitors to Punxsutawney, Jefferson County, located about 80 miles northeast of Pittsburgh.
USA restricts arms transfers to bloodied South Sudan
Companies and entities seeking a license to export defense materials to South Sudan will be denied under the new restrictions. South Sudan is the worlds youngest country, and has been supported by the USA since it's inception in 2011.
Polar bears are starving as Arctic ice melts, warns U.S. study
And they should lobby the global community more to address greenhouse gas emissions, which threaten the polar bears' habitat. While four bears put on weight, five bears lost up to 10 per cent of their body weight - between 18 and 20 kg - in 10 days.
Snow on and off this weekend
Clouds will be building from midday on, while the southwest winds take temps back to normal and even slightly above normal levels. Bank Stadium which is a covered dome, but during pregame time fans outside will have to deal with single digit temperatures .
Former Australian PM Rudd sues broadcaster
The filing cabinets in question were sold off especially cheaply, because they were clearly full, and no-one could find the keys. The government has ordered a review into how the cabinets were disposed with the files in them.
Russian Federation to US Navy: Get new maps
The five clips , lasting 6-11 seconds each, apparently show the US Navy aircraft and the Russian warplane shadowing it. The U.S. aircraft was flying over the Black Sea in global airspace when the interception happened.