Pentagon spokesman Col. Steve Warren has confirmed that on Monday, the US launched its second attack on an ISIS “cash collection point” in as many weeks, destroying another pile of unspecified cash in the middle of the large city of Mosul.

As with the previous incident, there were reports of civilian casualties in the attack, though Col. Warren insisted the Pentagon was willing to accept some civilian deaths in the attack, and that the initial estimates were that they only killed “in the single digits.”

Pentagon officials had similarly indicated that in the previous attack they were “comfortable” with civilian casualties in the scores, but that they believed they’d only killed between 7-9. Those deaths have not been formally confirmed by the Pentagon, however, who usually denies reports of civilian deaths as a matter of course.

Col. Warren termed the killings “tragic” but did not indicate that the Pentagon had any qualms about launching such attacks, but warned that ISIS was likely to keep its cash in smaller amounts spread around multiple locations in the future to keep it from getting blown up.

While the first such strike was believed to have destroyed a few million dollars in cash, this latest strike is conspicuous in its lack of details, with officials making no attempt to estimate what they actually destroyed, suggesting the figure will seem less impressive, and less worth the casualties inflicted on the civilian population.

Of course, launching strikes that they know will kill civilian bystanders is widely held to be illegal under international law, and officials made a big deal with the previous attack about launching the strike late at night to limit the number of people around the area. In this case, no such assurances were given.