By Vanessa Buschschlüter
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Watch: Gunshots heard in Haiti streets as people take cover
A war between Haitian gangs which has left hundreds dead since it flared up three weeks ago has spread to the centre of the capital, Port-au-Prince.
Gang members engaged in a fierce gun battle with each other and with police on Wednesday.
The city's temporary cathedral caught fire amid the fighting.
It is not yet known how many people were killed in this latest battle but UN figures suggest more than 200 died between 8 and 17 July.
Previously, the focal points of the battle between the G9 criminal alliance and a rival alliance calling itself G-Pèp had centred around the impoverished neighbourhood of Cité Soleil. But on Wednesday, video showed police confronting gang members not far from the presidential palace.
While Port-au-Prince has long suffered from gang violence, the war between G9 and G-Pèp has raised it to new levels.
Local media say members of a gang which forms part of the G9 alliance launched an incursion into the Bel-Air neighbourhood, where they met resistance from members of a gang allied with G-Pèp.
A spokesman for the Port-au-Prince archdiocese, Father Marc Henry Siméon, told Le Nouvelliste newspaper that firefighters had managed to extinguish a blaze at the church which has been used as the city's cathedral since the Notre-Dame Cathedral was destroyed in the 2010 earthquake.
Fr Siméon said he did not know whether the church had been targeted deliberately or had become "collateral damage" but stressed that "bandits" were operating in the area with total impunity.
Bullet casings were found in classrooms at the university's science faculty and classes have been suspended until further notice.
Inmates at the National Penitentiary broke out of their cells as gunfights raged nearby but the prison's director said the situation was under control.
One resident described Port-au-Prince as "lawless".
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By Vanessa Buschschlüter