The Mumbai attacks have caused political tension, with one of India's chief ministers offering to resign over the way the situation was handled. Diplomacy between India and Pakistan has suffered amid allegations that the gunmen had Pakistani links. But why should we care about relations between the two?
The biggest reason that people are concerned about tensions between India and Pakistan is that both countries have nuclear weapons.
The pair have been at odds for years, often over the disputed region of Kashmir.
More recently they have been working on a peace process but that's now been suspended.
Indian Minister of State of External Affairs Anand Sharma described the attacks as a "grave setback" to the normalisation of relations with Pakistan.
Offer of support
It's not hard to find strong views on the streets of India after the Mumbai attacks.
Indian troops are already being mobilised towards its border.
But there's been diplomacy over the weekend, with Pakistan's government condemning the attacks and offering support to India.
Husain Haqqani, Pakistan's Ambassador the US, has spoken of a possible collaboration in tracking down the perpetrators.
He said: "They have not presented evidence so far. We are willing to look at the evidence - we will work with them on the evidence.
"I think there's a lot more at stake here than just blaming Pakistan."
Afghanistan issue
But big tensions remain between Islamist groups and those who want democracy in the region.
Whatever happens, the outcome is vital to Britain.
Some of the British men who bombed London back in 2005 were trained in Pakistan.
And the UK still needs Pakistan's support in its fight in neighbouring Afghanistan.
Now, both Britain and America are appealing for calm between the nuclear-armed neighbours.
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