US officials have launched an investigation into the killing of a lion in Zimbabwe but say they have been unable to reach the American involved.
According to a BBC report, the US Fish and Wildlife Service (FWS) said it was “deeply concerned” about the “tragic” death of Cecil the lion.
Director Dan Ashe said they will “go where facts lead” but efforts to reach Walter Palmer have been unsuccessful.
Mr Palmer says he thought the hunt was legal but two Zimbabwean men have been arrested over the popular lion’s death.
The dental practice he runs in Minneapolis has been closed since he was named as the tourist who shot Cecil, Zimbabwe’s most famous lion.
Protesters gathered outside the building on Wednesday, carrying placards saying “Justice for Cecil”, “Trophy hunters are cowards” and “Prosecute poachers”.
On Thursday, the White House said it would review a public petition to extradite the American dentist after more than 100,000 signed it.
But spokesman Josh Earnest said it was up to the US justice department to respond to any extradition order.