It's been reported that the two people under arrest are Becky's step-brother, Nathan Matthews, and his girlfriend, Shauna Phillips. They are being held on suspicion of murdering the teenager.
Police confirm the female suspect, who is reported as being Shauna Phillips, was taken to hospital last night after feeling unwell.
She has since returned to custody.
Hundreds of flowers have been placed outside Becky's St George home.
This follows the tragic news that body parts were discovered in the search for the missing 16-year-old.
Bristol City beat Leyton Orient last night to go ten points clear at the top of League 1.
City recovered from conceding an early goal to beat struggling Leyton Orient 3-1.
Despite Orient scoring within 5 minutes, City quickly equalised with a Luke Freeman close range finish.
Anden Flint scored a powerful header to put Bristol City firmly in control and in the second half Aaron Wilbraham scored his 16th goal of the season to put the game our of sight.
Close rivals MK Dons were beaten at home by Chesterfield which means City now have a 10 point lead at the top of the table.
A couple from Weston-super-Mare have won over a million pounds in the Lotto Jackpot.
They say they're planing to spend their lucky fortune on paying off their mortgage and helping their grown-up children do the same.
It's been reported that the two people under arrest are Becky's step-brother, Nathan Matthews, and his girlfriend, Shauna Phillips.
Other media outlets have begun naming the pair over the last 24 hours and it indicates that Becky may have known her killer.
Police in Bristol have until this afternoon to charge or release Matthews and Phillips, who are being held on suspicion of murdering the teenager.
Yesterday detectives announced that body parts had been found during the search for the 16 year-old, who went missing from her home in St George nearly two weeks ago.
In total, seven people in their 20s are in police custody.
People living around Salisbury Plain may notice an increase in military activity. The army is staging a big exercise to test that its Lead Armoured Task Force is prepared for deployment. Residents have been warned to expect more vehicles such as tanks on roads in the area.
Two radio DJs broke the law when they prank-called a hospital caring for the Duchess of Cambridge, Australia's high court has ruled.
Mel Greig and Michael Christian were put through to a nurse at King Edward VII, who gave information about the Duchess' condition after being told the call was from the Queen and Prince Charles.
Indian-born Jacintha Saldana, 46, committed suicide three days later.
The decision in favour of the Australian Communications and Media Authority (ACMA) came after a challenge by radio station 2Day FM, which argued that the watchdog did not have the authority to rule that the actions were illegal.
Following the high court ruling, the station could be fined or lose its licence.
Greig and Christian have since apologised for the prank, with Greig attending Saldana's inquest in London.
This year's Bristol Half Marathon is officially launched this morning. Up to 15,000 runners are expected to take part in the event, which will take place on Sunday 13th September. Organisers say they hope it will raise more than a £1 million for charity.