The UVF has threatened to orchestrate "serious disorder" in east Belfast tonight, according to police. PSNI Assistant Chief Constable Alan Todd said he had received information that indicated the group intended to "orchestrate and participate in serious disorder" in the east of the city. It comes as bonfires take place across Northern Ireland as part of the Eleventh night celebrations. Meanwhile, cars and a bus were hijacked and set on fire on the outskirts of Belfast and in nearby Newtownards tonight. The remnants of a pipe bomb were found close to one of the contentious bonfire sites after reports of a loud bang in the area on Wednesday afternoon. Another security alert forced the closure of a dual carriageway beside Belfast City Airport, preventing arriving passengers leaving the terminal building on Wednesday night. Masked men also blocked roads close to the Ulster Hospital in Dundonald with burning cars. A significant police presence remained in place in parts of east Belfast on Wednesday night. The violence is linked the moves to limit the size of bonfires at Bloomfield Walkway and Cluan Place in east Belfast. On Tuesday evening, a High Court judge ordered that the Bloomfield Walkway bonfire be reduced in height. Police moved into the area at around 5.30am on Wednesday morning, but loyalists set it alight before the material could be seized. The Cluan Place bonfire was cleared later on Wednesday, with police escorting masked contractors. The threat from the UVF is believed to be directed at police officers. In Newtownards, Co Down a bus carrying passengers was hijacked by masked men, who were believed to have been carrying firearms. None of the passengers were injured in the incident which took place around 7.30pm on Wednesday. The bus was hijacked in Blenheim Drive and later set on fire. Police were also at the scene of nearby Messines Road which was blocked by burning tyres. On the Upper Newtownards Road in Dundonald a number of masked males pushed a car into the road and set it on fire close to Robbs Road at around 9.45pm. A further report was received that two cars were set on fire close to the Carrowreagh Road. 'Dissidents reponsible' for shots at police Meanwhile, dissident republicans were responsible for a volley of gunfire on police in Derry last night, the PSNI has said. In a fourth night of violence, six shots were fired at officers close to the city's walls. None of the officers were injured and the bullets were found both in the walls themselves and nearby trees. It is believed the shots were automatic gunfire that came from the vicinity of the Bogside Inn. Around 16 petrol bombs and five paint bombs were also thrown close to the walls and at police patrols. The PSNI is treating the incident as attempted murder and the Terrorism Investigation Unit has started investigations into the incident. District Commander Superintendent Gordon McCalmont said police believe dissident republicans fired the shots, and engineered the recent disorder. "Officers who were in the city last night to deliver a community safety operation are wakening up this morning trying to come to terms with what could have been. "We are offering them every support," he said. "It is quite clear that this attack was carried out by violent dissident republicans who we believe engineered the disorder we have seen in the city over the last number of nights. "While this is a serious and disturbing escalation it will not deter us from doing our job and that is protecting the people of this district." Northern Ireland Secretary Karen Bradley has condemned the incident. "Anyone, who was in this part of the city, at this time, including children or young people could have been killed," she said. "This murderous attack has to be condemned by all right-thinking individuals. "I would call on all people of influence within the community to continue their efforts to encourage dialogue and reduce tensions.<doc-sep>Never miss a thing from Belfast and beyond - sign up for FREE newsletter direct to your inbox Invalid Email Something went wrong, please try again later. Subscribe Thank you for subscribing We have more newsletters Show me See our privacy notice The Holywood Road has reopened following a security alert this morning. A PSNI spokesperson said: "The suspicious object was examined by police and was declared a hoax. All roads have now re-opened to traffic." (Image: Zoe Watson) Police had cordoned off a section of the road between Circular Road and Inverary Avenue in East Belfast early this morning. And Army Technical Officers were called in. 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The Ulster Volunteer Force is planning "serious disorder" in Belfast tonight, police have warned. Assistant Chief Constable Alan Todd warned the Belfast UVF "intend to orchestrate and participate in serious disorder" on a night when bonfires are held. And he urged people not to get involved "in any violent or criminal behaviour". His statement issued on Wednesday evening came following a day of disorder in the east of the city. Trouble flared after materials from two bonfires were removed. Assistant Chief Constable Alan Todd said: “Police have received Information from the community which indicates that the East Belfast UVF intend to orchestrate and participate in serious disorder in East Belfast this evening directed against my officers. “I would strongly urge people to desist from engaging in any violent or criminal behaviour. I would also appeal to those who have influence in this community to discourage people from taking part in any illegal activity. “The safety of the public and my officers is of paramount importance and accordingly I will be reviewing my resourcing plans to ensure there is an appropriate and proportionate policing operation in place to deal with any disorder should it occur.” Meanwhile, police said that they remain in attendance in Cluan Place and Clandeboye Drive areas of East Belfast following reports of a loud bang earlier this afternoon. A spokesman said: "The remnants of what is believed to be a viable pipe bomb type device have been found in Clandeboye Drive and we would ask for your patience and support as police work to make the area safe."