Activist groups claim airstrikes carried out in Syria on Friday and Saturday; now confirmed U.S. as the source.

New airstrikes in the Syrian city of Khan Sheikhoun, which suffered chemical attacks on Tuesday, have been carried out, according to “regional activist” groups in the country. The activist group did not confirm who carried out the airstrikes. An Arab news website Al-Masdar Al-‘Arabi reported that the U.S. airforce was the source of the strikes, with more than 20 killed and dozens more injured.

Al-Masdar called the attack by the U.S. a war crime.

The missiles hit an Internet coffee shop in Hanida a town in western Raqqa countryside according to Al-Masdar.

Eight victims names were released by the news agency:

Aboud Al-Share and his two sons.
Ibrahim Muhammad and his son.
Yaseen Huwidy and his son.
Hamoud Al-Aani.
Fouwaz Al-Aani.
Ahmad Al-Muhammad.
Abd Al-Baset Al-Muhammad.
Majd Al-Yaseen.

UPDATE: 11:30 A.M.  EST –

Reuters reported that the strike was the U.S.-led coalition against the Islamic State and killed 15 people including four children according to the Observatory for Human Rights.

The Observatory for Human Rights stated that one woman was killed and several others were wounded.

A Russian frigate carrying cruise missiles was recently stationed in the area in the wake of the U.S. airstrikes on Thursday as tension between the U.S. and Russia heats up.

[RELATED: Russia: Warship Steaming Towards U.S Destroyers In Response To Syrian Strike?]

[RELATED: Syrian Media: U.S Air Strike On Syria Kills Four Children]

The recent casualties add to the nine civilians and four Syrian servicemen killed and two missing from the initial U.S. airstrikes in the town. The uncertainty about who conducted the airstrikes is in light of a U.S.-Russian memorandum on Syrian air space being suspended by the Russian Foreign Ministry on Thursday.

[RELATED: Russia Memorandum on Syria “Suspended” by Putin after Trump Attack]

(THIS IS A DEVELOPING STORY CHECK BACK FOR UPDATES)