Two planes in a formation of three aircraft crashed shortly before 0930 GMT, Basel-Landschaft police said in a statement.
Earlier on August 22, seven people had been killed at an airshow on the English seaside when a military jet failed to pull up out of a loop and crashed into a road.
Read: Seven killed in British airshow crash as jet hits road
The Hawker Hunter aircraft taking part in the Shoreham Airshow on the southeast coast hit several cars, creating a fireball and sending thick black smoke billowing into the air.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ