Ilunga said of the current 25 deaths, only one has been confirmed as Ebola, adding that no new health professionals have been contaminated.
The risk to countries in the region is now determined as "high", but the global risk remains "low".
Previous reports of the disease had all been in remote areas where Ebola might spread more slowly.
The meeting of the Emergency Committee would decide whether to declare an official public health emergency, which would trigger more worldwide involvement and free up more resources to deal with the outbreak.
Earlier Thursday, the ministry had only three confirmed cases, one of which - the first in a major urban area - had prompted an urgent World Health Organisation meeting for Friday to decide what measures should be taken, including the possible declaration of a public health emergency.
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The city of about one million people is a transport hub on the River Congo, prompting fears that the virus could now spread further, threatening the capital Kinshasa and surrounding countries.
"What we're saying though is that urban Ebola is a very different phenomenon to rural Ebola because we know that people in urban areas can have far more contacts, so that means that urban Ebola can result in an exponential increase in cases in a way that rural Ebola struggles to do".
"All must be done to isolate the Ebola cases, especially since there has been a case in Mbandaka city", said EU Humanitarian Aid Commissioner, Christos Stylianides.
Ebola is a rare and deadly disease caused by a virus.
But WHO advised against any restriction of travel and trade to the Democratic Republic of the Congo based on the now available information. Moreover, WHO said that no restrictions have issued on global travel.
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West Africa experienced the largest recorded outbreak of Ebola over a two-year period beginning in March 2014; a total of 28,616 confirmed, probable and suspected cases were reported in Guinea, Liberia and Sierra Leone, with 11,310 deaths, according to the WHO.
"This is a concerning development, but we now have better tools than ever before to combat Ebola", Tedros Adhanom Ghebreyesus, WHO director-general, said of the new urban case. On average, about 50% of people who become ill with Ebola die.
However, it needs to be stored at a temperature of between -60 and -80 C, which is a challenge in DR Congo because electricity supplies are unreliable.
This is the ninth outbreak of Ebola in DR Congo - it was named after the country's Ebola river.
She warned that the disease can be transmitted via human contact with the body fluids of an infected person and is fatal.
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