The United States' latest coordinated strikes against ISIS targets comes as Washington signals sustained pressure on the terror group.

U.S. forces have commenced a large-scale strike against Islamic State group infrastructure and weapons sites in Syria following an attack on U.S. and partner forces in Syria last week that killed three Americans.

The operations, conducted in collaboration with Syrian forces, aim to strengthen regional security and address the ISIS threat, according to US Central Command.

Over a nine-day period, U.S. and allied forces conducted 11 operations that killed at least seven ISIS fighters and destroyed four weapons caches.

U.S. forces killed at least seven members of the Islamic State group and captured another 18 throughout 11 missions between Dec. 20-29 in Syria.

The US military has attacked three more alleged drug boats, killing a total of eight people, the US Southern Command said Monday night.

When an attacker killed two US service members and a civilian interpreter in Syria over the weekend, President Donald Trump vowed “very serious” retribution against those responsible and officials were quick to describe the assailant as a “lone gunman” who was a member of ISIS.