DUSHANBE, Tajikistan: Two small explosions hit the Tajik capital before a high-profile meeting between the leaders of Afghanistan, Pakistan and Russia, injuring no one, officials said Monday.

The incidents highlighted concerns about security in this impoverished Central Asian nation, which has recently seen clashes between government troops and militants in areas near the Afghan border.

The Prosecutor General's office said one of the explosions occurred Sunday outside a hotel several blocks away from the presidential palace in the impoverished Central Asian nation.

Another went off near a luggage storage facility of a local airport.

Investigators have declined to comment on who might have been behind the attacks.

Earlier this month, authorities arrested three local citizens on suspicion of planning terrorist attacks in the capital, Dushanbe. Police said they were members of the Islamic Movement of Uzbekistan, an al-Qaeda-linked militant group that has operated in ex-Soviet Central Asia and Afghanistan.

Officials also said the three men had combat experience in Afghanistan and in Pakistan's turbulent tribal regions.

The IMU, which had training camps in Afghanistan and fought on the side of Taliban, is believed to have suffered setbacks in US-led military operations there. Some analysts have speculated that security operations along Pakistan's border with Afghanistan may have compelled militants to return to their home countries in Central Asia.

Tajikistan shares a poorly protected 830-mile border with Afghanistan.

Also this month, officials say five militants with Russian citizenship were killed in a gunfight at a remote military checkpoint near the border with Afghanistan.

The presidents of Russia, Afghanistan, Pakistan and Tajikistan will meet Tuesday in Dushanbe for discussions expected to focus on communications and transportation. The talks are seen as part of Moscow's efforts to boost its security role in the region.