The far-right Alternative for Germany (AfD) has re-elected its leadership duo at the party’s conference, following its gains in the recent European election.

Meanwhile, thousands of people protested outside, with some demonstrators attempting to block roads and clashing with police.

AfD took 15.9% of the vote to finish second in the European Parliament election on June 9, despite recent scandals and setbacks.

People gather to demonstrate against the AfD national party conference in Essen
Thousands of people demonstrated outside (dpa via AP)

That was lower than its support in surveys at the beginning of the year, but a particularly strong performance in the formerly communist east has bolstered its hopes of emerging as the strongest party in three state elections there in September.

At the party’s two-day conference in the western city of Essen, co-leaders Alice Weidel and Tino Chrupalla were elected unopposed to new two-year terms.

They were backed by 79.8% and 82.7% of delegates respectively – a display of harmony by the party’s often argumentative standards.

Ms Weidel vowed to work to “tear down the unspeakable so-called firewalls” that other parties have set up against working with AfD.

A heavy police presence was in place in Essen, where local authorities had tried to find a way to prevent the AfD event, but lost their case in court.

Protesters hold banners
Large-scale protests were organised against the party, which celebrated good results in the European elections (dpa via AP)

Organisers said a march through the city attracted some 50,000 people, German news agency dpa reported. Thousands attended other demonstrations.

Protesters staged sit-ins on streets and crossings near the convention hall.

Early on Saturday morning, a group of demonstrators tried to get through a barrier and was pushed back by police using pepper spray and batons.

There were also incidents in which masked demonstrators attacked officers, according to police, who reported several arrests.

Two officers were kicked in the head while a politician was being escorted through a group of protesters and were taken to hospital, police said, while another seven were slightly injured.

Ms Weidel told delegates as she opened the meeting that “what is going on out there has nothing to do with democracy”, and said that “we are here and we will stay”.

Participants of the AfD party conference are escorted by police
Some police were hurt during unrest (dpa via AP)

AfD’s recent setbacks included the party sidelining its top two candidates from the election campaign due to scandals and being kicked out of its hard-right group in the European Parliament.

Mr Chrupalla said that “we could have taken 20%” in the European vote and complained that reporting on the two candidates was “unfair and disproportionate”.

But he also acknowledged that “with careless and unprofessional behaviour, some have unnecessarily offered room for attack”.

“That way, we take two steps forward and one step back, but in the future we must take three steps forward,” he added, arguing that the party needs to take a closer look at its candidates.