The death toll from two bombings in Pakistan's eastern city of Lahore has risen to six, with at least 26 others wounded.

Local police say the first bomb placed under the seat of a bicycle went off Thursday near a national monument - Minar-e-Pakistan. Minutes later, a second device detonated in a crowded shopping district in a central part of the city.

After the bombings, police stepped up security across the region while investigators said they were probing various leads. There has been no immediate claim of responsibility.

In an unrelated development, Pakistani security forces arrested at least 10 suspected militants and recovered weapons in the remote North Waziristan region - the scene of a major military offensive last week against al-Qaida-linked militants.

Some information for this report provided by AFP and AP.