Demonstrators said police were shooting into the crowd with rubber bullets, although police would not comment.
Police on Saturday used tear gas and rubber bullets on demonstrators who vandalized cars and shops.
Military police reacted by firing rubber bullets into the gathering of 200 at around 18:30 local time.
The doctors said their findings dismissed the theory that rubber bullets were safe.
They were introduced by security forces at the height of the Troubles to replace rubber bullets following a string of fatalities.
Of those, 152 were found to have been injured by rubber bullets.
It wasn't clear whether police had used live ammunition or rubber bullets.
Police fired rubber bullets and tear gas to disperse protesters who threw stones and vandalised buildings, the BBC's Anbarasan Ethirajan reports from Dhaka.
Shadow home secretary Ed Balls asked her for information on guidance issued to police on the use of water cannon or rubber bullets.
Anti-riot police used rubber bullets and tear gas canisters to disperse the crowd that invaded the pitch after Malawi lost 1-0 to the visitors.
State Wildlife Officers are firing salvos of firecracker shells, rubber bullets, and underwater charges to drive off a herd of about a hundred sea lions.
They have helped test the impact of nonlethal munitions like plastic and rubber bullets and have helped determine the best kind of footwear for land-mine clearance teams.
At Sanarpar, outside Dhaka, police fired rubber bullets and tear gas at strikers who set light to a lorry, police chief Abdul Matin told AFP news agency.
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Nowadays such forces are readier to fight protesters with distance weapons (such as rubber bullets) rather than grappling with them at close quarters, as British bobbies do.
But police spokesman Abdulla Nawaz told the BBC that his officers had used minimal force and he also denied allegations that rubber bullets were being used against the protesters.
Bangladeshi police have fired tear gas and rubber bullets to disperse Islamist activists protesting at the trial of their leaders for war crimes allegedly committed during the independence war.
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Mrs May said she had not suggested the use of rubber bullets and added that water cannon had "yet to be approved" for police use by the Home Office.
After the police fired rubber bullets and tear gas at the rioting fans, Malawi FA president John Zingale went onto the pitch and demanded that they desist from using force.
On September 3rd four miners were wounded by rubber bullets when security guards fired on a hostile crowd at the gates of a gold mine near Johannesburg, the commercial capital.
But Mr Godwin also rejected suggestions that his commanders had used the wrong tactics or were lacking specific tools, such as water cannon or baton rounds, also known as rubber bullets.
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