The National Transport and Safety Authority (NTSA)  has suspended all operations of bus company Modern Coast.

This comes a day after an accident involving one of its buses killed 33 passengers, and injured scores at Nithi bridge. 

In a statement, NTSA Director General George Njao said that the suspension will apply to 31 buses belonging to the company operating several routes with the country.

"A thorough multi-agency investigation into the crash and an evaluation of the operator's safety operational standards is currently underway," reads part of the statement.

Meanwhile, the death toll from the Sunday accident hit 33 on Monday morning after more passengers who had sustained injuries succumbed while undergoing treatment.