At least 23 people were killed in airstrikes in Syria allegedly carried out by the US-led international coalition in areas under the Islamic State (IS) terror organisation's control in Syria, said a British war monitor on Tuesday.

The Syrian Observatory for Human Rights (SOHR) said that 13 civilians and three IS militants were among those killed in an airstrike near the town of al-Bukamal on the Syrian border with Iraq, Efe news reported.

There were also bombings at one of Bukamal's entrances and on al-Hamar oil field in the same town.

Seven other people, including two women and a minor, died in a similar strike against al-Hasaniya village.