Zimbabwean conservation authorities are hunting another US citizen involved in an illegal lion killing. The search for Jan Casmir Sieski began a week after a global outcry broke out over the killing of 13-year-old Cecil the Lion, illegally hunted and killed by US dentist Walter James Palmer in Zimbabwe's Hwange National Park."Jan Casmir Sieski was in the country in April and allegedly bow-hunted and killed a lion illegally."Zimbabwe Parks and Wildlife Management spokesman Caroline Washa-Moyo confirmed the arrest of Headman Sibanda, the owner of Nyala Safaris, in connection with the illegally conducted Sieski hunt.She said Sibanda was arrested after a tip-off.The trial of Theo Bronkhorst, the Zimbabwean who facilitated the Palmer hunt, continues on Wednesday.Washa-Moyo said Zimbabwe Parks and Wildlife Management and law enforcement agencies had launched a crackdown on "undesirable elements" in the country's scandal-plagued hunting industry.Bow hunting has been suspended with immediate effect and no such hunting will be allowed unless the authority gives permission in writing.Washa-Moyo said the government had tightened up on the hunting industry, putting new measures in place with immediate effect."Hunting of lions, leopards and elephant for all quotas issued for 2015 has been suspended."It is also illegal for quotas to be transferred from one hunting area to another. Any such transfer will be regarded as poaching."On Friday the Zimbabwean government confirmed that it asked its US counterpart to assist in securing the extradition of Palmer on poaching charges...