Formula One’s second morning of testing was cancelled after a loose drain cover struck Lewis Hamilton’s Mercedes and the Ferrari of Charles Leclerc.

Both Hamilton and Leclerc hit the debris at Turn 11 in Bahrain, and the running was red-flagged with one hour and 40 minutes remaining.

Circuit officials attempted to repair the track, but after a delay of nearly 40 minutes, it was announced that the running would not resume.

The one-hour lunch break was brought forward by an hour. The afternoon session will now run for five hours, instead of four, starting one hour earlier than planned at 2pm local time (11am GMT).

Ferrari said the impact caused damage to the floor of Leclerc’s Ferrari, which has since been replaced.

The morning session of the second day of Formula One testing in Bahrain was cancelled on Thursday due to a loose drain cover

Lewis Hamilton drove over the cover in testing, with debris flying away from the incident

Hamilton has been in Bahrain for the start of testing ahead of his final season with Mercedes

It is unclear at this stage how extensive the damage was to Hamilton’s Mercedes.

Both Hamilton and Leclerc were unharmed in the incidents.

Last November, a water valve cover broke free from the newly-laid tarmac of the Las Vegas street circuit and tore into the underbelly of Carlos Sainz’s Ferrari at 210mph.

Speaking at the time, Ferrari team principal Fred Vasseur called the incident ‘unacceptable’.

Hamilton’s future team-mate, Charles Leclerc, also collided with the cover during the session

Ferrari team principal Fred Vasseurbranded the incident ‘unacceptable’ and said it caused damage to the floor of the car

Hamilton, competing in his final season for Mercedes ahead of his switch to Ferrari, is scheduled to be behind the wheel of his new machine all day. He was sixth when the red flag was deployed.

Max Verstappen finished fastest on Wednesday. The test concludes on Friday ahead of next Saturday’s first round of the season, also in the Gulf kingdom.