Saudi Arabia has executed four more prisoners, bringing the number of people put to death since January to 113.

The Interior Ministry says the four executions took place Wednesday. Three were Saudi men convicted of murder while the fourth was a Syrian national found guilty of smuggling large quantities of amphetamines.

The kingdom has executed more people so far this year than all of 2014, which saw 83 people beheaded or executed by firing squad.

A report issued by the human rights group Amnesty International on Tuesday found that between January 1985 and June 2015, at least 2,208 people were executed in the kingdom.

Saudi Arabia applies the death penalty to a number of crimes including murder, rape and drug smuggling.