(AP Photo/Boris Grdanoski). Police try to block the protestors to enter into the parliament building in Skopje, Macedonia, Thursday, April 27, 2017.
The confrontation came several hours after demonstrators rushed into the parliament building and assaulted several lawmakers following a controversial vote to elect a new parliament speaker.
Police blocked the entire area around the parliament building.
The violence started when dozens of protesters, many masked, broke through a police cordon after the speaker's election, shouting, throwing chairs and wielding camera tripods abandoned by startled journalists. "Democracy must run its course", Johannes Hahn, the European Union enlargement commissioner, said on Twitter.
The U.S. Embassy in Macedonia constitutes the largest U.S. representation in any Balkan state and has recently struggled to not be dragged into the domestic political debate. Ivanov also said that all political parties should be responsible for their actions.
"I call upon all institutions to behave responsibly respecting the Constitution and the laws of the Republic of Macedonia".
The demonstrators were angry over Thursday's election of a new parliament speaker despite a months-old deadlock in efforts to form a new government.
Ethnic Albanians make up around a quarter of Macedonia's population, more densely so near the border between the two countries.
Authorities in Kosovo also expressed concern.
Among the injured was Social Democrat leader Zoran Zaev and leader of the opposition, who was pictured with blood running from his head.
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"Such fast and coordinated reaction is an indisputable proof that what's happened (in Skopje) had been planned in advance and had an unofficial blessing of foreign patrons of the Macedonian opposition", Alexei Zaitsev from the Russian Foreign Ministry said in a statement.
"We condemn the violence in parliament in the strongest terms", said the United States embassy in Skopje, Macedonia's capital.
European Union commissioner in charge of enlargement, Johannes Hahn, said: "I condemn the attacks on MPs in Skopje in the strongest terms. Democracy must run its course", Hahn tweeted.
"There is no issue that can not be resolved through dialogue in accordance with the Constitution and laws of the Republic of Macedonia", Ivanov said.
From the Parliament which is occupied by the protesters, Zaev said that he is convinced that the Ministry of Interior will not allow an escalation of the situation and will prevent major incidents.
The VMRO DPMNE party, which has been trying to prevente the election of a new speaker and a new government for a month, called the move unlawful and an "attempted coup".
The protesters were voicing their disapproval of the coalition electing Talat Xhaferi, a former defence minister from the ethnic Albanian DUI party, as president of the parliament.
His party, along with ethnic Albanian allies, voted in the Albanian speaker promoting massive outcry. Zaev suggested electing one by bypassing procedures, but tensions boiled over when parliament chose Xhaferi.
Gruevski and his nationalist VMRO-DPMNE party ruled Macedonia for a decade until December previous year when the election saw VMRO-DPMNE secure 51 seats in the 120-seat parliament - two more than the SDSM - but the conservatives failed to reach a deal with kingmaking Albanian parties.
Moscow backs the position of Mr Gruevski and supporters, and claims - without offering evidence - that the West is part of a conspiracy to install a multi-ethnic government in Skopje, which would seek to carve up the Balkans to help create a "greater Albania" - a notion that alarms Slavs in Macedonia, Serbia and Bosnia. Instead, SDSM leader Zoran Zaev formed an alliance with the smaller ethnic Albanian parties to reach the necessary majority. But President Gjorge Ivanov has refused to give him the mandate to govern, arguing the chances that Zaev might agree to the language demands could threaten the country's sovereignty.
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