The Pentagon will escalate its military support by giving Israel Iron Dome air defense systems, a senior defense official said Tuesday. U.S. intelligence officials, in their most detailed account of the incident yet, said they have “high confidence” that Israel was not responsible for the apparently accidental explosion that killed scores of people at al-Ahli Hospital in Gaza City; some initial reports attributed responsibility to Israel. Analysts could only conclude with “low confidence” that Palestinian fighters were responsible.