Sauber team boss Monisha Kaltenborn has scolded her drivers after Marcus Ericsson and Felipe Nasr collided with one another during the Monaco Grand Prix.
With Ericsson trailing Nasr on a different strategy, the team requested he be let through, but Nasr refused to do so, which led to the Swede attempting a pass into La Rascasse. However the pair ended up making contact, which eventually led to a double retirement, which Kaltenborn described as "unacceptable" and promised it wouldn't happen again.
"It was unacceptable behaviour by both drivers," she said. "Today the work of the whole team ended in a collision.
"Marcus and Felipe both know how much work is put into every race weekend. They have the responsibility to make it to the end of the race."
Explaining the situation, Kaltenborn made it clear that Ericsson was quicker and should have been let through as requested by the team.
"After evaluating the overall situation, it was important to bring the fastest car as far as possible to the front, so that we were able to use any chances," she added.
"Our decision was based on the data from both cars. After this, we have clarified the situation internally and both drivers are aware of their responsibilities. Such an incident will not happen again."
Both drivers apologised to the team and accepted a share of the blame for the coming together.