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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The foreign secretary's suggestion last week's bombing of an aid convoy might constitute a war crime prompted an angry response from Moscow.
Goals from Charlie Austin, Dusan Tadic and James Ward-Prowse consigned Slaven Bilic's men to their fourth straight Premier League loss.
Showers will continue in the north and west, heavy in places.