Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Last week, the American-backed Syrian Democratic Forces announced that it had taken Raqqa, the Syrian city, which had served as ISIS' capital. The taking of the city is the latest in a series of substantial military blows to ISIS' fortunes. However, Americans should not expect the fall of Raqqa to have a substantial effect on the jihadist threat at home. The threat posed by ISIS to the United States has long come primarily from its ability to inspire and enable attacks -- and not from its territorial holdings in Syria and Iraq. Since ISIS burst onto the global scene in 2014, seven individuals motivated by jihadist ideology have killed 74 people inside the United States in six attacks, according to New America's research. Though they may have been inspired by ISIS, none of those attacks were carried out under direct command by the group, and none of the deadly attacks involved a fighter who had returned from Syria or Iraq.David Sterman: Although the fall of Raqqa is a military blow to ISIS, the group and its ideology still remain a threat to the USISIS is quite effective at inspiring and enabling attacks thousands of miles from its base 
 Question:Although there have been non-lethal attacks and foiled plots in which the plotters communicated with _ militants abroad.

ISIS