ThereSA国际影视传媒檚 still no sign of a group of overdue fishermen amid an ongoing search and rescue operation on Great Slave Lake. 

The search effort, led by Hay River and Joint Rescue Command Centre (Trenton), began Monday after the four men were reported overdue to police around 4 a.m. 

The men, who left the commercial dock in Hay River early Sunday en route to Sulphur Point on the south shore of Great Slave Lake to check fishing nets, were expected to return before nightfall the same day. 

Search efforts on Monday focused on the south shoreline from Hay River to Pine Point, with a 440 Squadron aircraft used to scan the area. The search area was then extended north on Great Slave Lake, states an update from . 

A Transport Canada aircraft, using radar and infrared equipment, searched the lake and the area between Hay River and Yellowknife. 

TuesdaySA国际影视传媒檚 search will focus on the northern shores of Great Slave Lake, from Yellowknife to Gros Cap, and from Hardisty Island toward the Mackenzie River, states the news release. 

A Hercules aircraft and a helicopter have been deployed by JRCC. The Civilian Air Search and Rescue Association is also assisting in the search. 

SA国际影视传媒淲e are continuing to coordinate the search efforts with the possibility of bringing additional aircraft and vesselsSA国际影视传媒� states Sgt. Brandon Humbke, of the Hay River . 

SA国际影视传媒淚f there is any information on the missing personSA国际影视传媒檚 location(s), we ask you to contact the Hay River detachmentSA国际影视传媒� added Humbke.

While weather conditions improved overnight, are still urging community members not to assist in the search for their own safety. 

Updates to follow.