ɪn tˈuː θˈaʊzənd fˈɪftiːn, jˌuːˈɛs əfˈɪʃəlz ɹˈeɪzd sˈeɪfti kənsˈɜːnz ɐbˌaʊt sˈɪɾi sˈaɪtsiːɪŋ tˈʊɹz ˈæftɚ sˈɜːʔn̩ ɪɹˌɛɡjʊlˈæɹᵻɾiz wɜː dɪskˈʌvɚd ænd ɐ mˈeɪdʒɚ kɹˈæʃ əkˈɜːd ɪn sˌæn fɹænsˈɪskoʊ.
In 2015, US officials raised safety concerns about City Sightseeing tours after certain irregularities were discovered and a major crash occurred in San Francisco.