Dan Arel writes:---
This announcement follows shortly after the Boston show being cut short due to Morrissey's illness (throat, according to Boston post-show reports).
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Update: 06/27 15:56 GMT: Philadelphia postponement and statement now posted on the site Iron Horse:

Morrissey
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Show Postponed
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The Pines Theatre
June 27 • 7 pm

Morrissey regrettably had to end his show at Boston's Bank Of America Pavillion last night after 30 minutes due to a throat infection that made it impossible for him to continue. The audience of almost 5000 strong experienced a fantastic opening 7 numbers that included classics The Queen Is Dead and The Last Of The Famous International Playboys. In the intro to National Front Disco Morrissey explained to the audience that he was ill and said "unfortunately it will not just be the emotions cracking tonight but my voice as well." Three songs later he was unable to continue and the show came to a cose. Morrissey was seen by a doctor immediately and put under strict orders not to sing for 3 days. As a result the shows in Northampton, Mass tonight and Philadelphia on Friday night have also been postponed. It is hoped that new dates will be announced for each city in the next 48 hours. All tickets will be honoured for the new dates. The tour will continue in New York at Madison Square Garden on Saturday night as scheduled. More information will be posted here as it becomes available.