(WASHINGTON) — President Joe Biden is now speaking with Israeli Prime Minister Benjamin Netanyahu, a source familiar with the call told ABC News, their first conversation since seven World Central Kitchen aid workers were killed in an Israeli airstrike in Gaza.

Biden had strongly condemned the incident, saying he was “outraged.” He was expected to further express his anger and concerns about Monday’s strike as part of a broader call with Netanyahu, who called the situation “tragic” and unintentional.

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