The shooter, described as a "young white man," wore body armour and a helmet, witnesses said.
Nobody was killed or injured in the attack, which happened at dawn as some worshippers were praying inside.
The fire at the Diyanet Mosque in New Haven caused considerable damage, but there were no injuries.
The EU Parliament in Brussels is one of the most monocultural places on this very multicultural continent.
Turkish President Tayyip Erdogan on Friday (May 3) condemned deadly attacks in places of worship as he inaugurated the country's largest mosque, Camlica in Istanbul.
At least one of the mosques was reportedly vandalised with a sledgehammer, according to a statement released by West Midlands Police.
An emotional Haka was performed on Saturday outside the Al Noor mosque in Christchurch, where 41 died in Friday's attack on two of the city's mosques.
Politicians and world leaders condemned the deadly shootings at two mosques in New Zealand on Friday
Christchurch mosque shootings: what we know
Police in New Zealand say 49 people have been killed at two mosques when at least one gunman opened fire on worshippers.
Turkish President Tayyip Erdogan wrapped up a three-day visit to Germany on Saturday with a visit to Cologne, where a security lockdown kept supporters and protesters away from a ceremony to open the country's largest mosque.
Watch: Syrian state television shows Assad arriving at the al-Rawda mosque.
Security camera footage from the Masjid Agung Bangli mosque shows a line of worshippers suddenly get up and run as the earthquake hits, knocking panels from the ceiling onto the floor.
Mosques & imams accused of not fostering a "positive mindset" towards Austria, and receiving illegal foreign funding.
Chancellor Sebastian Kurz's right wing government announces crackdown on "Islamist ideology" andf foreign funding of religious groups.
Egypt's armed forces are waging an unprecedented battle to crush "terrorist organisations" by the end of February
The death toll in Egypt's worst militant attack in modern history has now passed 300
Militants have killed hundreds of police and soldiers over recent years in Egypt but appear to have shifted tactics with Friday's attack on a mosque
Militants detonated a bomb and then gunned down worshippers as they fled.
29 people are killed and 64 injured in an explosion at the largest Shiite Muslim mosque in Afghanistan's Herat province.
Palestinian President Mahmoud Abbas has announced that the Palestinian leadership will freeze all contact with Israel, as mass protests over new Israeli security measures at the al-Aqsa compound turn deadly.
Musims protest over Israeli security measures imposed at religious site in Jerusalem - dozens injured in clashes
Two police officers have died in a shooting outside Jerusalem's holiest site. The three gunmen were killed at the scene.
The driver apparently failed to get past protective barriers and no one was injured.
Heavy street fighting slows Iraqi army in final push against ISIL in Mosul's Old City
In a statement posted online, ISIL says the iconic mosque and its 840-year-old minaret were destroyed by a US airstrike.