DUBAI/WASHINGTON, April 21 -- Iran is considering attending peace talks with the United States in Pakistan, a senior Iranian official told Reuters on Monday, following moves by Islamabad to end a US blockade of Iran's ports, a major hurdle for Tehran to rejoin peace efforts. However, the official stressed that no decision had been made. Adding to the uncertainty, a source told Reuters that Vice President JD Vance was still in the US, denying reports that he was already on his way to Pakistan's capital Islamabad for the dialogue. With a two-week ceasefire set to expire this week, the senior Iranian official said Tehran was "positively reviewing" its participation but no final decision had been made. The comments conveyed a clear change of to...