ST. LOUIS, Missouri (AP) -- About 180 people were trapped inside the 630-foot Gateway Arch for about two hours after an apparent power outage, authorities said.
Tim Johnson kisses his wife, Trudy, after he and three of their six children were trapped in the arch Saturday.
The power went out around 8:45 p.m. Saturday night, stalling two trams filled with about 40 people each, said Mike Maris, deputy superintendent of the Gateway Arch.
About 100 other people were stranded at the top of the monument of stainless steel, Maris said.
He said the evacuation of the south tram, where one of nine cables may have broken, took about two hours.
Power eventually was restored to the north tram, and stranded visitors no longer had to use the stairs to evacuate, said Capt. Steve Simpson, a spokesman for the St. Louis Fire Department. He said officials do not know what happened to equipment.
Simpson said rescue crews treated two people. One was given oxygen and the other was diabetic. He did not elaborate on their treatment.
"Everybody else seemed to be in good spirits, glad and relieved to be coming down," he said. Watch people being evacuated from the Gateway Arch »
Anxious relatives stood outside the popular tourist attraction as rescuers worked inside. Dozens of emergency vehicles surrounded the arch.
Maris said the Arch would be open Sunday with only the north tram running.
The 630-foot-tall structure is operated by the National Park Service and opened in 1966. It is one of the region's most popular attractions. E-mail to a friend
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All About St. Louis
The Gateway Arch in St. Louis, Missouri. 
On Saturday at 8:45 p.m. (CST), a power outage due to equipment failure at the Gateway Arch in St. Louis, Missouri trapped 40 people in the two arch trams and 100 people in the observation center at the top of the Arch.

It took about two hours to evacuate the south tram after one of the nine cables supporting the tram car possibly snapped because of a power failure. The north side tram and people in the observation center had to walk down approximately 300 feet of steps to a freight elevator to be taken to the bottom of the Arch. They were met by anxious families who had been waiting for hours outside the Arch. Two people needed treatment for minor injuries.

The Gateway Arch will be back open Sunday with only the north tram operating. The National Park Service opened the Gateway Arch in 1966 and is one of the region's most popular attractions.