Pakistan Taliban claimed responsibility for the attacks.
The first remote-controlled improvised explosive device blast occurred in Mansehra district, killing two policemen this morning.
A few hours later, second blast hit a police vehicle and claimed the lives of four cops in Urmagai area of central Kurram Agency bordering Afghanistan, officials said, adding that security forces cordoned off the area and launched a search operation.
Tehreek-i-Taliban Pakistan, meanwhile in a statement, said that it has carried out both the attacks.
Kurram is one of the most sensitive tribal areas as it borders three Afghan provinces. It is adjacent to North Waziristan region where security forces have launched an offensive againsgt the Taliban.