US forces struck more than 30 Islamic State targets in Syria over the last two weeks, extending the military response to a deadly attack on American and Syrian troops in December.

Ten airstrikes between Feb 3 and Feb 12 hit infrastructure and weapons storage targets “to sustain relentless military pressure on remnants from the terrorist network,” US Central Command said in a statement.

An earlier series of strikes on Islamic State targets began in late January after Centcom said it would transfer as many as 7,000 detainees linked to Islamic State from Syria to Iraq, citing a risk of escape.

President Donald Trump pledged to retaliate against Islamic State after two US soldiers and an interpreter were killed in a Dec 13 ambush in Palmyra, Syria.

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More than 50 Islamic State terrorists have been killed or captured and more than 100 of the group’s infrastructure targets have been hit in the campaign, Centcom said Saturday.