The UN Security Council has backed a resolution calling for sanctions against leaders of rebels in the Democratic Republic of Congo.
The resolution, adopted unanimously, came hours after the rebels seized the eastern city of Goma.
The rebels met little resistance from the army or UN peacekeepers.
In its resolution, the Security Council demanded an end to foreign support for the M23 rebels and expressed readiness to take appropriate measures.
After M23 fighters entered Goma, the leaders of DR Congo and Rwanda, Joseph Kabila and Paul Kagame, flew to Uganda for talks, amid claims that Rwanda was backing the rebels.
Mr Kabila has urged people to "resist" the rebels, who launched their rebellion seven months ago.
But there was no resistance from the nearly 1,500 UN peacekeepers in the city, which lies two hours' drive away from Rwanda's capital, Kigali.
A UN spokesman said its peacekeepers had held their fire as rebels took the city to avoid triggering a battle, putting civilians at risk.
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Who are the M23 rebels?
M23 rebel in North Kivu town of Rubare near Rutshuru. 5 Aug 2012
In the resolution, proposed by France, the members of the Security Council strongly condemned the rebel seizure of Goma and asked Secretary General Ban Ki-moon to look into reports that external support had greatly increased the rebels' military capability.
They have already imposed sanctions on the head of the M23 rebel group and are planning to target more leadership figures, BBC UN correspondent Barbara Plett reports.
Goma, with a population of about one million, is the main city in resource-rich eastern DR Congo and is the main point for processing minerals coming out of the country.
Some locals reportedly shouted "welcome" and "thank you" as M23 leader Sultani Makenga and hundreds of his fighters entered Goma.
But the UN has said it has received reports that the rebels have abducted women and children from Goma. Killings and looting have also been reported.
The UN has a 22,000-strong force in DR Congo, known by its acronym Monusco. French Foreign Minister Laurent Fabius has described as "absurd" the UN's failure to intervene in Goma, calling for a change in its mandate.
But UN deputy spokesman said that with only 1,500 peacekeepers a "value judgement" had to be made: "Do you open fire and put civilians at risk or do you hold your fire, continue your patrols, observe what is happening and remind the M23 that they are subject to international humanitarian and human rights law?"
During Monday's UN Security Council hearing, diplomats from DR Congo and neighbouring Rwanda wrangled over responsibility for the rebellion, AFP news agency reported.
While sanctions have already been ordered against M23 leader Sultani Makenga, the new resolution (2076) calls on the UN sanctions committee to review urgently the cases of other M23 figures, including Innocent Kaina and Baudouin Ngaruye.
