A 65-year-old woman and a 25-year-old arrested on suspicion of encouraging or assisting a suicide are mother and son.
The pensioner and her son were held after police suspected they were planning to take her husband to the Dignitas clinic in Switzerland to commit suicide, according to Press Association sources.
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A rollercoaster has come off the rails at a theme park in Scotland, leaving eight children and two adults in hospital.
"I saw a lot of smoke come out from the tail-end of the aircraft. I wondered if it was normal, whether it was just exhaust fumes."
The House of Commons Petitions Committee has said they will keep an eye on the petition and are concerned about fraudulent signatures.