Read this: Initially, officials were unable to contact the Wolong National Nature Reserve, home to around 280 giant pandas. However, the Foreign Ministry later said that a group of 31 British tourists visiting the Wolong Panda Reserve in the quake-hit area returned safe and uninjured to Chengdu. Nonetheless, the well-being of an even greater number of pandas in the neighbouring panda reserves remained unknown. Five security guards at the reserve were killed by the earthquake. Six pandas escaped after their enclosures were damaged. By May 20, two pandas at the reserve were found to be injured, while the search continued for another two adult pandas that went missing after the quake. By May 28, 2008, one panda was still missing. The missing panda was later found dead under the rubble of an enclosure. Nine-year-old Mao Mao, a mother of five at the breeding center, was discovered on Monday, her body crushed by a wall in her enclosure. Panda keepers and other workers placed her remains in a small wooden crate and buried her outside the breeding centre.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What place could officials not contact?
the Wolong National Nature Reserve