RICHMOND, B.C. - Mounties in Richmond, B.C, say two Chinese nationals have walked away from tour groups visiting the Lower Mainland, bringing the total number to four since last summer.

Police say 52-year-old Suqin Feng was last seen early Feb. 19 at Richmond's Holiday Inn Express, but when her roommate awoke Feng was gone and had taken her own luggage.

They say video surveillance shows Feng left the hotel on her own accord and with her luggage around 4 a.m.

Almost one month earlier, 61-year-old Yanyun Chen was also reported missing from the Hampton Inn.

Police say Chen was scheduled to meet her shuttle bus Jan. 22 but never did, and she and her luggage were not on the return flight to China.

Police say they have contacted Chinese consular officials, the RCMP's missing persons unit and the Canada Border Services Agency.

They're asking for public assistance in locating the individuals.

"While foul play is not suspected in any of the incidents, it’s concerning that tourists are being reported missing from tour groups," said Cpl. Sherrdean Turley, of the Richmond RCMP in a statement.

"Considerable time and resources must be devoted to ensuring the well being of these persons."

A police news release did not give further information on the other two people who police say walked away.

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    This combination of photos shows (L) the Beijing skyline during severe pollution on January 14, 2013, and the same view (R) taken during clear weather on Febuary 4, 2012. Dense smog shrouded the city with pollution at hazardous levels for a fourth day and residents were advised to stay indoors. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • CHINA-ENVIRONMENT-THEME-POLLUTION

    This combination of photos shows (top) the Beijing skyline during severe pollution on January 14, 2013, and the same view (bottom) taken during clear weather on February 4, 2012. Dense smog shrouded the city with pollution at hazardous levels for a fourth day and residents were advised to stay indoors. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • A man walks on an frozen lake on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

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    A woman wears a mask as she waits for a bus in Beijing on January 15, 2013. Public anger in China at dangerous levels of air pollution, which blanketed Beijing in acrid smog, spread as state media queried official transparency and the nation's breakneck development. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

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    A man shops for air purifyers in Beijing on January 15, 2013. Public anger in China at dangerous levels of air pollution, which blanketed Beijing in acrid smog, spread as state media queried official transparency and the nation's breakneck development. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • CHINA-ENVIRONMENT-POLLUTION

    A child wearing a mask walks in a park in Beijing on January 15, 2013. Public anger in China at dangerous levels of air pollution, which blanketed Beijing in acrid smog, spread as state media queried official transparency and the nation's breakneck development. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • CHINA-ENVIRONMENT-POLLUTION

    A sales assistant stands next to air purifyers at a shop in Beijing on January 15, 2013. Public anger in China at dangerous levels of air pollution, which blanketed Beijing in acrid smog, spread as state media queried official transparency and the nation's breakneck development. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • CHINA-ENVIRONMENT-POLLUTION

    A man wearing a mask reads a newspaper at a subway station in Beijing on January 15, 2013. Public anger in China at dangerous levels of air pollution, which blanketed Beijing in acrid smog, spread as state media queried official transparency and the nation's breakneck development. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)

  • Pigeons fly over the courtyard of a neighborhood on a hazy day in central Beijing, China, Tuesday, Jan. 15, 2013. One of Beijing's worst rounds of air pollution kept schoolchildren indoors and sent coughing residents to hospitals, but this time something was different about the murky haze: the government's transparency in talking about it. (AP Photo/Alexander F. Yuan)

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  • A man wearing a mask walks on a stone bridge in a park on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

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    Air pollution hangs over the skyline as the sun rises over the central business district in Beijing on January 14, 2013. Dense smog shrouded the city with pollution at hazardous levels for a fourth day and residents were advised to stay indoors. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

  • Skyscrapers are obscure by heavy haze in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)

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    A cyclist wearing a mask prepares to cross a road during severe pollution in Beijing on January 12, 2013. Air quality data released via the US embassy twitter feed recorded air quality index levels so hazardous that they were classed as 'Beyond Index'. By 4pm the particle matter (PM) 2.5 figure was 728 on a scale that stops at 500 at which point the US embassy website advises against all outdoor activity. AFP PHOTO / Ed Jones (Photo credit should read Ed Jones/AFP/Getty Images)