The mother of a baby mauled to death by a dog was downstairs with her boyfriend at the time, police have said.
Chief Superintendent Chris Bithell of Lancashire Police called the incident "absolutely horrific" and said both suspects will be questioned by detectives today.
The baby was upstairs in a bed in one of the front bedrooms and the two people who are currently in custody, they were downstairs when the attack took place.
More top news
The maintenance worker spent 10 days in hospital after plunging 9.5 metres from a scaffold tower at a disused station.
Workers and managers are to stage another strike on Saturday amid a long-running dispute over jobs, pensions and closures.
The unexpected call could prompt a diplomatic rift with China, which regards Taiwan as a breakaway province from its mainland.