A prominent Musliminfo-icon lawyer and member of Myanmarinfo-icon's ruling party was shot dead along with a taxi driver outside Yangon's international airport on Sunday, officials said.

Ko Ni, a legal adviser to Aung San Suu Kyi's National League for Democracy (NLD) party, was gunned down as he got into a taxi outside the arrivals lounge at about 5pm by an assassin who also killed the driver.

"According to our initial information, Ko Ni and the taxi driver were killed," a security source at the airport said.

"An unknown man shot him in the head while he was hiring a taxi. He was later arrested," the source added.

Zaw Htay, a spokesman for the president's office, said Ko Ni had just returned from an official trip to Indonesiainfo-icon.

"He (Ko Ni) was shot while he was waiting for a car outside the airport. Ko Ni died on the spot," he said.

There were no reports on possible motives behind the murder but the daylight slaying would do little to calm already heightened nerves within Myanmar's Muslim community.

Myanmar's border regions have simmered for decades with ethnic minority insurgencies. But it is rare for prominent political figures to be murdered in Yangon, the country's booming and largely safe commercial hub.

However, in recent years Myanmar has witnessed a surge of anti-Muslim sentiment, fanned by radical Buddhist nationalists.

Ko Ni, a legal adviser to the NLD, was a rare voice advocating religious tolerance and pluralism.

In late 2015 Suu Kyi's NLD party won a landslide election victory, ending decades of military-led rule. But in what analysts widely saw as a sop to Buddhist hardliners, the party fielded no Muslim candidates, despite boasting many senior Muslim figures in its ranks.

Suu Kyi has also faced international censure for her failure to criticise an ongoing armyinfo-icon crackdown against the Muslim Rohingya minority in western Rakhine state.

Since the launch of the crackdown in October at least 66,000 Rohingya have fled to neighbouring Bangladeshinfo-icon alleging that security forces are carrying out a campaign of rape, torture and mass killings.

The treatment of the Rohingya, a stateless group denied citizenship in Myanmar, has galvanised anger across the Muslim worldinfo-icon.

Many among Myanmar's Buddhist majority call them Bengalis -- shorthand for illegal immigrants from Bangladesh -- even though many have lived in Myanmar for generations.