Detectives hunting murder a suspect over the killing of a young mother arrested a 25-year-old man on suspicion of assisting an offender, Greater Manchester Police said.
Police are still searching for 28-year-old Michael Cope and have offered a £5,000 reward to anyone who may be able to help him come forward.
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On the day of the race, the fundraising website went down due to a rush of last-minute donors.
The device was found outside the gates of Holy Cross Boys' Primary School in Belfast.
The Liberal Democrat leader has been attacked after he refused to say that he does not believe gay sex is a sin.