Israeli and Palestinian Authority forces exchanged fire in the northern Samaria city of Nablus on Tuesday morning in what the Israel Defense Forces is reporting to be a case of mistaken identification.

“During operations to arrest terrorist operatives in the city of Nablus, a firefight broke out between IDF soldiers and people who were identified by the troops as suspects. After the fact, it was determined that it was Palestinian security services personnel,” the IDF said in a statement, adding that the incident would be investigated.

According to P.A. media, the IDF entered Nablus without providing customary notification to the P.A. and opened fired on a security-services building, where one member of the P.A. security forces was lightly injured. No Israeli soldiers were wounded in the incident.

Overnight, IDF troops arrested 18 P.A. terrorism suspects throughout Judea and Samaria.