After the service, the president and first lady were planning to visit privately with relatives and friends of firefighters killed in the explosion, the White House said.

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With two bathrooms, a media room and numbered bunk beds matched with towel hooks and luggage storage, the summer-camp-style space was designed to house their three teenagers along with their friends and relatives who frequently visit with them.

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Sierra was in regular contact with friends and relatives during the trip and had told them she would visit Galata Bridge, which spans Istanbul's Golden Horn waterway, to take photos.

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