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Mayor Betsy Hodges said she asked for the chief’s resignation.
The chain faced criticism after refusing to reduce the cost of the morning-after pill.
The violence came at the end of a day of deadly clashes over tensions at a major Jerusalem shrine.
The US president said he is “grateful” for Mr Spicer’s work.
Specialists at Great Ormond Street Hospital say the therapy is experimental and will not help.
Disputes over the shrine, revered by Muslims and Jews, have set off major Israeli-Palestinian confrontations in the past.
MPs have expressed "grave concerns" over a new Government programme aimed at helping disadvantaged jobseekers and people with disabilities into work.