The Syrian city of Khan Sheikhoun — the site of Tuesday’s chemical attack — was hit by airstrikes on Friday and Saturday, according to two activists in the city and regional activist groups.

At least one woman was killed and three other people injured in Saturday’s strike, two activists in Khan Sheikhoun said.

It wasn’t immediately clear who conducted Friday’s and Saturday’s strikes.

A Russian frigate armed with cruise missiles was heading to the Mediterranean in an apparent show of force a day after the first direct military strike by the US against the Syrian regime.