Raikkonen dug deeper on his next run, producing a 1m27.199s lap to wrestle top spot back from Hamilton with just under 15 minutes of the hour remaining.
Considered to be one of the fastest tracks of Formula 1, Silverstone Circuit is hosting the British Grand Prix on Sunday and the qualifier for it shortly. The machine spun and went into the gravel crashing with the barrier.
Despite the head-on impact, Hartley was able to climb out of the vehicle unscathed and was cleared and released after being checked in the medical center, leaving him fit to take part in qualifying if possible.
The session was red-flagged to a stop. On top of that, the team faces a fix job to ensure Hartley's auto is ready for qualifying, which starts at 2pm local time.
But the huge shunt brings worrying safety concerns for Toro Rosso, who were then checking the sister vehicle of Pierre Gasly to try and understand what broke and what went wrong.
Lance Stroll and Sergey Sirotkin finished 16th and 17th, just ahead of Stoffel Vandoorne.
Ryan Fox falls agonisingly short at Irish Open
Jorge Campillo (65) was in third place, a shot further back, and defending champion Jon Rahm was in a share of fourth after a 66. The highest of those was host Rory McIlroy, who shot a 71 to finish in the top 30 on -2.
Thousands of state employees fired in Turkey
The current parliamentary system will end on Monday after constitutional changes were approved in a 2017 referendum. Some 3,077 army soldiers were also dismissed, as well as 1,949 air force personnel and 1,126 from the naval forces.
Warframe is making its way to Switch
Panic Button recently teased that it is working on a major Switch port and that the title would be announced this month. Warframe is available now for PC, PlayStation 4, and Xbox One, with a Nintendo Switch release date coming soon.
British PM appoints Dominic Raab new Brexit minister
When the Conservatives returned to power in 2010, he spent his time on the backbenches campaigning on civil liberties issues. Labour Party chairman Ian Lavery said: "This is absolute chaos and Theresa May has no authority left".