Washington is reportedly seeking clarification from Jerusalem after Omar Abd al-Majid As'ad, an 80-year-old Palestinian-American, suffered a fatal heart attack following his arrest by Israeli soldiers near Ramallah on Wednesday morning.
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The military said it has opened an investigation into As'ad's death.
US State Department spokesman Ned Price said, "We have been in touch with Mr. As'ad's family to express our condolences about this tragedy. We're providing all of the consular assistance to the family at this time. We've also been in touch with the government of Israel to seek clarification about this incident, and as you may have seen the Israeli Defense Forces have indicated that there's an ongoing investigation into the matter."