<div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>A major law enforcement operation n the south-western United States in the search for Nancy Guthrie, near the missing 84-year-old's home, has ended without any arrests.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Multiple vehicles from crime fighting agencies, including SWAT and forensics units, descended on the house, about 4km from the Tucson home of Guthrie, mother of US TV host Savannah Guthrie.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Local authorities and the FBI also converged at a second location near where law enforcement activity was under way.</span></div></div><div><div id="adspot-mobile-medium"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/world/alexei-navalny-killed-by-poisoned-russian-dart/c48dde5f-253c-44b1-82e2-def50926f04c" rel="" target="_blank" title="Russia accused of killing opposition leader Alexei Navalny with 'dart frog toxin'"><strong><span>Russia accused of killing opposition leader Alexei Navalny with 'dart frog toxin'</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>It's unknown if the new location was related to the ongoing Guthrie investigation.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Authorities were seen investigating a grey Range Rover in a parking lot of a restaurant.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Both operations on Saturday ended without any arrests, reports CNN.</span></div></div><div><div class="OUTBRAIN" data-reactroot="" data-src="//www.9news.com.au/world/nancy-guthrie-search-police-release-three-people-after-raids/e7f7751f-f31f-4b7a-9d31-e7030d5584d7" data-widget-id="AR_5"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Law enforcement questioned one man but released him, believing him not to be the kidnapper, the official said. The man was cooperative.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Guthrie, 84, was reported missing on January 31.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Authorities say her blood was found on the front porch of her Tucson-area home.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/national/bundoora-man-arrested-after-major-police-operation-in-melbournes-northeast/a870ae31-0241-4aa5-b335-80e4b379ec0d"><strong><span>Four-hour Melbourne siege ends as man bitten by police dog</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Purported ransom notes were sent to news outlets, but two deadlines for paying have passed.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Guthrie was last seen at her Arizona home on January 31 and was reported missing the following day.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Authorities have expressed concerns for Guthrie's health because she needs daily medication.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>She is said to have a pacemaker and has dealt with high blood pressure and heart issues, according to sheriff's dispatcher audio on broadcastify.com.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><em><span> - With AP, CNN</span></em></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span></span></div></div>